Do you peeps know about the Konami Code? This code has been commonly used in Konami games to activate cheats and Easter eggs.

http://upload.wikimedia.org/wikipedia/commons/thumb/e/e2/Konami_Code.svg/300px-Konami_Code.svg.png

Do this in face book followed by enter and see what happens.

It also works on various other websites:

This one is cool:
http://www.bbc.co.uk/glow/


There are loads of others, too many to list but here's a few.

http://www.umass.edu/transit/
http://dce.uwinnipegcourses.ca/
http://snyper.co.uk/

There a konami code jQuery plugin, I've been trying to think of something to hide in my site I'm doing that already uses jQuery for quite a bit but can't think of anything worthwhile to do with it.

Also works on jquery.com, loads a jquery rockstar game that I'm really bad at.