During B.o.B's set Sunday at the KSFM 102.5 Live concert in Sacramento a trouble maker did more than just try to get up on the stage. He also took a swing at a security guard. Bad idea.
Can't really blame security for roughly putting the guy down and cuffing him. But, if you watched the whole video, you see one the guards get some more punches in as they led the guy away in cuffs.
The police are aware of the video, but we guess the guy thought it was fair play because he hasn't pressed charges.