Late 80's when I was still in high school I helped run a card shop that was opened up near my school. It was robbed and a lot of my own stuff was stolen from the shop, including a 53 Mantle.
Amazingly the kid who robbed the shop showed up back in the shop when the owner was there and was caught and most of the cards were recovered.
I guess I had the best revenge when I stole the kid's girlfriend from him shortly after.