Cheat: Debug Menu
Here's another worthwhile Debug Menu, and is one of the multiple 16-bit game cheats with an image of David Perry (he's also in Cool Spot). To access the Debug Menu, go to the Options screen and enter A, C, A, C, A, C, A, C, B, B, B, and B. You'll know this was entered correctly when you see David.
Also, we're pretty sure David's dead now.