Protected by Sam & Max decal
The Protected by Sam & Max decal is a car sticker that was available around the time Sam & Max Hit the Road came out.
While the sticker says "Protected by Sam & Max: Freelance Police", some claim these stickers are closer to being cursed. While working on Hit the Road, Larry Ahern once put a sticker on his truck window. The truck was stolen and gutted days later. Steve Purcell had one on his car when another car crashed into it in front of a comic store.
History of Sam & Max part 2b - Steve Purcell mentions the incidents involving the decal.