Here's a word of advice for anyone who ever runs into Justin Bieber: don't touch his face if you're not looking for a fight.
Bieber was caught on video punching a fan in the face during a tour stop in Barcelona, Italy on Tuesday night. According to Entertainment Weekly, when a fan ran up to Bieber's car and stuck his hand in the window, Bieber responded by jabbing the fan in the face. The unidentified fan ended up with a bleeding lip.
Prior to the incident, Bieber was greeting fans through the rolled down window of his car. Then, a male fan began reaching through the window and shouting that he'd touched Justin's face. TMZ got it all on tape; you can watch the video below.
[Photo: Getty Images]