A friend of mine on Twitter posted a message that the Konami code (arguably the most famous gaming cheat code ever) now worked on Facebook. I tried it out and got a spray of multi-colored bubbles that popped up on my screen whenever I scrolled or clicked on anything.
I was trying to figure out if this was some kind of marketing ploy that was about to come out, or if it was just a fun little Easter Egg, when I saw another friend post a link of other Konami coded sites available on the web. The list itself requires you to enter the Konami code to view it (use your arrow keys to type: up up down down left right left right, then the letter b, the letter a). For Facebook you need to hit Enter (or Return, if you're on a Mac) and scroll up or down.
I get pure delight from Easter Eggs like this. My favorite ever still being the little taxicab that would drive across the screen of my (now defunct) Palm Treo.
Log into your Facebook account and check the nerdiness out. And follow me on Twitter @nandita for more inane updates.