Earthworm Jim Easter Egg - "The Old Cheat Code"

In the SNES version of the game, pause, then press Y, A, B, B, A, Y, A, B, B, A.

The screen will go weird, and you'll be treated to a mocking message on a pink screen intended for Nick Jones, one of the game's programmers. It will tell you / him that the code you just entered is the "old" cheat code. Then the game resets.