Try these out
Just copy the following code on the address bar of your browers and press enter (you have to visit a site to try it out though)

javascript:R=0; x1=.1; y1=.05; x2=.25; y2=.24; x3=1.6; y3=.24; x4=300; y4=200; x5=300; y5=200; DI=document.getElementsByTagName("img"); DIL=DI.length; function A(){for(i=0; i-DIL; i++){DIS=DI[ i ].style; DIS.position='absolute'; DIS.left=(Math.sin(R*x1+i*x2+x3)*x4+x5)+"px"; DIS.top=(Math.cos(R*y1+i*y2+y3)*y4+y5)+"px"}R++}setInterval('A()',5); void(0);


And another one:
javascript:document.body.contentEditable='true'; document.designMode='on'; void 0


Pretty funny 

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That was AWESOME!!!

lol, nice, i used to have one that would open your CD drive lol.. then there was this one that had a message pop up that said alert click ok or something, but evey time you click ok ten more come up.. you had to use windows task manager to get out of it.. then there  was this other one that when you clicked it, it would scramle up ya screen like a puzzle the you would have to solve ot hahaha.