Teenage Mutant Ninja Turtles for the NES when I was about four. Interesting story behind that, actually...
My grandmother (during one of our monthly visits) told my dad that she had bought an NES at a garage sale, but it didn't work. I vaguely remember watching him take it apart before falling asleap (I was watching with interest, but bear in mind because I was five at the time). Later, my dad woke me up and asked me if I wanted to play. So I did. He told me as I was playing that he had to take it apart twice in order to figure out how it worked.
Anyway, my grama got up later and freaked out for not getting her up. Later she bought me some Legos so that I wouldn't play on the NES. I still play with Legos to this day (and I'm almost twenty).
Apologies if the above narrative was unnessecary; I always thought it was interesing, and may very well be what got my father into computers in the first place.