When I won a Sega Genesis by getting the high score in Bubsy at a local movie/game rental store.
To get into the finals I played Sonic 2 and had the best time, so I went last at the finals. So I borrowed my moms boyfriends Genesis and practiced the shit out of the level to get an even better time.
But then at the final, it ended up not being Sonic 2 and was Bubsy instead. The guy who went 2nd to last to me was friends with the people who worked there and he knew it was going to be Bubsy, so he beat the shit out of everyone elses score. However since I went after him, I basically did exactly what he did and then some, so I beat his score and won the Genesis.
This was like a month before Mortal Kombat 1 came out on Genesis and I was so hype I could play it with blood.