webtoy.review("katamari hack"):

turn any webpage into a game of katamari damacy. roll around the browser, picking up larger objects as your sphere grows in size. try it here.

or copy this into your location bar on any site.

javascript:var i,s,ss=['http://kathack.com/js/kh.js','http://ajax.googleapis.com/ajax/libs/jquery/1.5.1/jquery.min.js'];for(i=0;i!=ss.length;i++){s=document.createElement('script');s.src=ss[i];document.body.appendChild(s);}void(0);

Just right click anywhere on the page to roll your sphere towards your mouse.

Source: Katamari Hack