I don't have many EPIC WINZ in games. I mostly get pwned. However, I did score an EPIC WIN in 2007.
I was visiting this casino with a friend of mine from work and I was at the arcade while my friend gambled. I was playing this Fast and Furious arcade game by myself and I had a few other people join in. One of them was this snot-nosed, little 14-year-old brat who had this super powerful uber car he saved with the game's savecard system or whatever that is.
We all entered this championship mode where there was a series of races. The kid kept on mocking me about how I sucked at the game, even though I never played it before. I'm a veteran of Daytona USA and have played my fair share of arcade racing games, so I managed to hold my own and souped up my car with enhancements earned after each race.
So, we get to the final race where it's winner take all. The kid held onto first place for most of the race until the final jump before the finish line and he kept on bragging how he's going to win. I was right behind him and we both jumped off and he screwed up his landing while I had a great landing and used what's left of my Nitro to pass him and I beat his little snobby butt. After that, he cried foul, saying that I cheated when in fact, he just screwed up and I was there to reap the rewards.
So, that's one of my few EPIC WINZ! I may have more if I remember them.