1. The Konami Code
Cheat:The Konami Code
Yes, you knew this was coming. The Konami code has transcended the world of video games and become a pop culture touch stone. People who have no idea what the hell Contra is would probably know the code if you rattled it off in front of them. While it didn't start out in Contra (Gradius holds that title), it was probably most beloved in the Contra series just because of the game's damned difficulty. Even if you don't know dick about video games, you know this code.