Shake Your Web Browser.

 Place the following code in browser's Address bar.

CODE : 

javascript:function Shw(n) {if (self.moveBy) {for (i = 35; i > 0; i--) {for (j=n;j>0;j--){self.moveBy(1,i);self.moveBy(i,0);self.moveBy(0,-i);self.moveBy(-i,0); } } }} Shw(6)-accident




As you can see, the hyper browser is very amusing, but wouldn't last long enough for a sneak-attack prank. For this escapade, you'll likely need to edit the code to last a little longer. To do so, find the statement that says i = 35, and change the number to something larger (300 will buy you about 30 seconds, 600 a minute, and so on).