This is a video of two guys racing to beat Super Mario Brothers the fastest. They both are playing at the same time and it seems like when one guy falls behind he finds a way to make up the couple seconds that he needs to catch up. It takes about six minutes to beat the game which beats my best time of never beating the game. (Well, I haven't tried in a long time, I might be able to do it now... maybe.) Have a look:
At first I thought that this was just a couple of videos cut together, but at the end the lights go up and you can see it is legit.