Castlevania IV slew my SNES. Contra III was its accomplice. I didn't own either of those until I bought both on clearance at Toys Я Us sometime after I got an N64. I hadn't played the SNES in a while, but it was still hooked up. I put in Castlevania IV, the Konami logo popped up, and then the screen scrambled and went black. I thought it was a bad game, but after that, none of my other games would work, either. So I had to buy one of those ugly rounded piece of crap mini SNESes as a replacement. I never really forgave Castlevania IV for that fiasco. And nobody has to try to sound smart and point out that it probably wasn't the game that caused it, thanks.
Contra III was already one of my all time favorite games, so I pardoned it. Just like Contra on the NES, it was a perfect co-op action game. I never knew the people who made it went on to found Treasure, but it explains so much.