Who: Voula Papachristou
Olympics: London 2012

Greek triple jumper Voula Papachristou decided to get racist on Twitter ("With so many Africans in Greece, the West Nile mosquitoes will be getting home food!!!") and she was banned from the 2012 Games. We've got two things to say to Voula: 1. If you're gonna get kicked out of the Olympics for a joke, at least make it funny. 2. Didn't you see all the athletes failing on Twitter before you?