From TMZ:

Shia LaBeouf just headbutted a guy in a bar after what sounds like a nuclear argument over his girlfriend’s mom … and TMZ has the video.

At 6 seconds into the clip, you see Shia (wearing a white cap) headbutt a bald guy.

Shia screams at the guy, “What are you saying about my girl’s mom? Are you f**king kidding me bro?”

You hear a girl — presumably the girl Shia was with — screaming his name in a plea for him to stop.

The fight went down at a pub called Hobgoblin in South London Thursday night — in a pretty rough part of town.

Shia knows the pub well … he was in a fight at the same joint in November, 2012. And his bar fight history doesn’t end there … he also got his ass whooped on the street outside a Vancouver bar in 2011.

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