Note to Sean Penn: Cameras aren't for stomping and hotel bars aren't for the screaming -- unless you want to end up on camera.
The volatile and talented Oscar-winning actor -- and frequenter of San Francisco bars -- was captured on video having a temper tantrum, according to TMZ and others.
Penn, the Bay Area-based actor who starred in "Milk" and was known to frequent Tosca in North Beach, was in town to talk about Haiti at Salesforce.com's Dreamforce 2013 conference.
Following the talk about saving humanity, Penn was in the hotel bar of the St. Regis when a fan -- who was a Dreamforce attendee -- dared to take a cell phone photo of the actor.
Penn took the man's phone and "slammed it to the ground," according to the San Jose Mercury News.
"Do we look like [curse word] zoo animals?" Penn asked the man. "I'll make you eat the phone -- get the [curse word] out of here!"
TMZ, of course, has video of the incident, shot by more discrete individuals who were spared Penn's self-editing.
Penn complained to hotel management, who asked if the man wanted to call police. He did not.