Video Games - The Konami Code
Up, Up, Down, Down, Left, Right, Left, Right, B, A.
This is The Code. It comes with variants here and there, but usually it's this simple formula. Most of the time, it'll award you something nice like 27 more lives (make sure you put an extra 'B, A' at the end for Contra and other NES classics), or extra weapons, but on occasion, Konami likes to mess with you and put a digital hex on you when you use it.