Oh god. My office ruined an entire afternoon of productivity with this game. Not because we were playing, but because we were one-upping each other on hacking the game. Great fun!
Once you're bored of that, there are... a lot more[3]. CivClicker is particularly enjoyable[4].
[1] http://candies.aniwey.net/
[2] http://candybox.wikia.com/wiki/Computer
function a() { document.getElementById('bigCookie').click(); window.setTimeout(a, 100); } a()
EDIT: better: Game.cookies = Game.cookies*2