"From what I read, someone throws a wallet at Kid Cudi. He returns the wallet and it looks/sounds like he warns the person not to do it again. The thing is, he gives the wallet back to the wrong person so that person tosses the wallet back on stage. Kid Cudi gets pissed [or has to back up his words or look like a..] and reaches over the barricade and punches the wrong guy."
Everyone is of course telling the guy who got punched to sue, but apparently the guy is proud to have been punched by Cudi, haha."-theblackmarker