Back during the heyday of Atari 2600, so many people owned one that giving away promotional Atari games was often a smash marketing success for all kinds of products. Johnson & Johnson traded toothpaste UPC symbols for this promotional-only game Tooth Protectors, making it one of the rarest 2600 games ever made. Current bid's about $300.
Making this copy even more valuable is the fact that the box is still there. Johnson & Johnson may have been devoted to protecting your teeth, but they certainly didn't bother protecting their game with this flimsy cardboard-and-styrofoam box.
Tooth Protectors [eBay, via GameSniped]

