Ok, everyone forgot the worst ones...
I took a working (Quantum, Centipede, Robotron, Defender, Pacman, etc) and took out all of the stupid guts, and stomped on them. I then painted the sides purple and orange, installed a 4 player control panel, and now it plays 6,000 gameseseses. I mean, sure, I could have actually restored the game for $5, but instead I dropped it's value to .10c. but it PLAYS 6,000 GAMESESESESSESSSSSSS