Justin Bieber did Floyd Mayweather proud, punching a guy in the face hard enough to make him bleed bad.
The Biebs was in Barcelona, driving to perform Tuesday night, when a guy ran up to the car and stuck his hand in the window to touch him. Bieber responded with a quick jab to the face.
The guy ended up a bloody mess as he and his friends reacted in shock.
Source: TMZ.com