Konami Code generation, what cheat code will live in your brain until you die?

Question triggered by an answer to the Halo post, where somebobody mentioned Doom...and BAM, IDDQD just popped right into my head from the dark depths of my gaming memories.

Come on, Up Up Down Down Left Right Left Right B A Start people, whatcha got?

Edit: this thread is going to show up when retrogamers like me get stuck somewhere LOL

2 Edit 2 Furious: clearly we're NOT going to show up to those poor retrogamers as nobody is saying the game names LOL "you'll have to figure it out for your own damn selves!"