I just made a small quickie ASM hack for Bad News Baseball.
Normally, the game has Boys' teams and Girls' teams available, but in order to pick the Girls' teams, you need to enter a stupid code on two different controllers while resetting the game (Down+Left on controller #1, Up on controller #2).
I've hacked the game so you just press Select at the title screen to change it.

Download (40 bytes)