Sean Penn may have crossed the thin red line when dealing with a fan!
Sean was at the Lobby Bar at the St. Regis Hotel in San Francisco when a fan tried to take a photo of him!
According to a witness, Sean decided to go Kanye all over the amateur photographer, ran after him, grabbed his phone, and slammed it to the ground!
Too bad for Penn, you can't erase your actions! The fan not only left his phone, and heart, in San Francisco, he had Sean yell at him: