PHOTO: Shia LaBeouf arrives in Los Angeles after a trip to London. (Splash News, splashnews.com)

Shia LaBeouf allegedly headbutted a guy in a London bar called Hobgoblin on Thursday night after the man reportedly made a foul remark about Shia’s girlfriend’s mother.

In a horrifying video clip, posted by TMZ, Shia is seen headbutting a bald man around the 6 second mark. (Watch the video here.)

Shia, 27, is heard screaming, "What are you saying about my girl's mom?  Are you f**king kidding me bro?” A girl, presumably Shia’s girlfriend, is heard pleaing for him to stop.

According to TMZ, Shia did later apologize and insists he’s “super normal,” but gets angry when "people s**t on my girl's mom."

Shia, who recently revealed he’s retiring, has a history with bar brawls. The former actor was involved in another fight at the same pub in 2012, and a Vancouver bar fight was also caught on camera.

This all comes less than a week after the Nymphomaniac star tweeted, “In light of the recent attacks against my artistic integrity, I am retiring from all public life.”

Shia was accused of ripping off graphic novel writer Daniel Clowes for his short film, “HowardCantour.com.”

To make matters worse, the plagiarism allegations led Jim Carrey to publicly humiliate Shia at the Golden Globes on Sunday night.

“Dying is easy, comedy is hard,” Jim said as he took the stage on Jan. 12. “I believe it was Shia LaBeouf who said that. So young, so wise,” he joked as the audience cracked up. Shia fired back on Twitter and ended his online rant by declaring:

I AM NOT FAMOUS ANYMORE

— Shia LaBeouf (@thecampaignbook) January 13, 2014

Ironically, he’s not helping himself stay retired from public life. 

Follow me on Twitter @ChrisRogers86.