for ($i=0 ; $i<3 ; $i++) {
  switch($i) {
    case 1:
      // do some stuff
      break;
    case 2:
      // do some stuff
      break;;
    case 3:
      // do some stuff
      break;
  }
}
By Anonymous, 2015-07-22 14:40:25
        var u = "Browser";
        if (this.isIPad) {
            u = "iPad"
        } else {
            if (this.isDDGIgnore) {
                u = "Ignore"
            } else {
                if (/seamonkey/.test(x)) {
                    u = "SeaMonkey"
                } else {
                    if (/iceape/.test(x)) {
                        u = "Iceape"
                    } else {
                        if (/palemoon/.test(x)) {
                            u = "PaleMoon"
                        } else {
                            if (this.isFirefox) {
                                u = "Firefox"
                            } else {
                                if (this.isAndroid) {
                                    u = "Android"
                                } else {
                                    if (/xbox/.test(x)) {
                                        u = "xBox"
                                    } else {
                                        if (/midori/.test(x)) {
                                            u = "Midori"
                                        } else {
                                            if (/opr/.test(x)) {
                                                u = "Opera"
                                            } else {
                                                if (/maxthon/.test(x)) {
                                                    u = "Maxthon"
                                                } else {
                                                    if (this.isYandex) {
                                                        u = "Yandex"
                                                    } else {
                                                        if (/vivaldi/.test(x)) {
                                                            u = "Vivaldi"
                                                        } else {
                                                            if (this.isChrome) {
                                                                u = "Chrome"
                                                            } else {
                                                                if (/fennec/.test(x)) {
                                                                    u = "Fennec"
                                                                } else {
                                                                    if (/epiphany/.test(x)) {
                                                                        u = "Epiphany"
                                                                    } else {
                                                                        if (this.isFirefox) {
                                                                            u = "Firefox"
                                                                        } else {
                                                                            if (/uzbl/.test(x)) {
                                                                                u = "Uzbl"
                                                                            } else {
                                                                                if (this.isEdge) {
                                                                                    u = "Edge"
                                                                                } else {
                                                                                    if (this.isIE && navigator.platform === "Win64" && !k() && Modernizr.touch && document.documentElement.clientWidth == screen.width) {
                                                                                        u = "IEMetro"
                                                                                    } else {
                                                                                        if (this.isIE) {
                                                                                            u = "IE"
                                                                                        } else {
                                                                                            if (this.isOpera) {
                                                                                                u = "Opera"
                                                                                            } else {
                                                                                                if (this.isIPhone) {
                                                                                                    u = "iPhone"
                                                                                                } else {
                                                                                                    if (/arora/.test(x)) {
                                                                                                        u = "Arora"
                                                                                                    } else {
                                                                                                        if (this.isSafari) {
                                                                                                            u = "Safari"
                                                                                                        } else {
                                                                                                            if (this.isKonqueror) {
                                                                                                                u = "Konqueror"
                                                                                                            } else {
                                                                                                                if (this.isBlackberry) {
                                                                                                                    u = "Blackberry"
                                                                                                                } else {
                                                                                                                    if (/phantomjs/.test(x)) {
                                                                                                                        u = "PhantomJS"
                                                                                                                    } else {
                                                                                                                        if (this.isIDevice) {
                                                                                                                            u = "iOS"
                                                                                                                        }
                                                                                                                    }
                                                                                                                }
                                                                                                            }
                                                                                                        }
                                                                                                    }
                                                                                                }
                                                                                            }
                                                                                        }
                                                                                    }
                                                                                }
                                                                            }
                                                                        }
                                                                    }
                                                                }
                                                            }
                                                        }
                                                    }
                                                }
                                            }
                                        }
                                    }
                                }
                            }
                        }
                    }
                }
            }
        }

Found when looking at facebook.com code and formatting using google chrome developer tools.

By jcubic, 2017-01-03 18:38:30
<img src="../../../../../../../../../../../../../../../../../assets/logo.png" />
By Anonymous, 2015-07-22 14:46:50
const int TWENTY_EIGHT = 28;
By adeward, 2017-09-14 10:12:28
#62 C# +298
protected Int32 Sum(int one, int two)
{
    int result;
    int tmp;
    
    tmp = one + two;
    result = tmp;
    return result;
}

Jesus.

By Anonymous, 2016-05-29 17:19:14
// sleep 150s
for ($a = 0; $a < 150 ; $a++ ) { 
      sleep(1);
}
By Anonymous, 2015-07-22 14:42:11
def absolute_value(value):
    if str(value)[0]=='-':
        value = -1 * value
        return value
    else:
        return value
By Random student of algorithms., 2017-12-12 04:32:36
<!-- Renders an horizontal line -->
 
<center>____________________________________________________________________________</center>
By Anonymous, 2015-07-22 14:38:41
.toolbar-menu-tabs > * {
    border-left: 1px solid #f0f0f0;
}

.toolbar-menu-tabs > * + * {
    /* a lot of stuff here */
}
By Anonymous, 2016-07-28 15:58:05
#64 :) PHP +185
        if ($act_number)
        {
        	$act_number = $act_number;
        }
        else
        {
        	throw new Exception("Документ еще не подготовлен.");
        }
By wata5h1, 2016-07-07 17:09:32
public boolean checkFalse(Boolean bool)
{
  if (bool.booleanValue() == Boolean.FALSE.booleanValue())
  {
    return Boolean.FALSE.booleanValue();
  }
  else
  {
    return Boolean.TRUE.booleanValue();
  }
}
By Anonymous, 2017-12-12 17:35:17
public bool IsTrue(bool value) {
    return value.ToString().length() == 4;
}
By Anonymous, 2018-04-04 15:46:36
var show = true;

function toggleShow(){
    if(show === true){
        show = false;
        return show;
    }else{
        show = true;
        return show;
    }
}

return show = !show, dude...

By Anonymous, 2017-07-14 09:50:57
dotychczasowyPostep += predkosc * 1;
By tb, 2017-03-29 22:35:52
for module in next_possible_modules: 
  import math; math.factorial(40000) # approx. a 1 second operation 
  end_time = start_time + timedelta(minutes=module.duration) 
By Anonymous, 2017-12-12 20:23:37