Shia LaBeouf was reportedly mixed up in an altercation in a London pub after a reveler tried to take his baseball cap.

The Transformers star was allegedly visiting the Hobgoblin venue in New Cross, South London, with his Nymphomaniac co-star Mia Goth during a trip to the U.K.

He posed for snaps with several fans, but things turned nasty when one patron grabbed his hat and refused to give it back.

The pair was then involved in a scuffle, according to Britain's The Sun.

Landlord Mark Harris tells the publication, "Her (Goth's) mum lives just down the road. She came down to see her mum and he tagged along."

"He did get a bit frustrated and there was a bit of a scuffle."