What is that one video game cheat code you’ll never forget about?

I’ll start us off with the classic “Explode All Cars” cheat from the classic 2004 game Grand Theft Auto: San Andreas, as that is one that I remember using a lot for no rhyme or reason:

R2, L2, R1, L1, L2, R2, SQUARE, TRIANGLE, CIRCLE, TRIANGLE, L2, L1