Shia LaBeouf, 24, had to be cuffed and detained by cops last night (around 1 a.m. Sunday), after a fight broke out at a Los Angeles bar. A bouncer reportedly restrained the actor in a head lock on the scene before police intervened. No arrests were made.

As reported by RadarOnline, the ‘Wall Street: Money Never Sleeps’ star was hanging at Mad Bull’s Tavern, with an entourage of more than a dozen buddies, when an angry exchange with a patron occurred on the bar’s sidewalk patio out front.

A witness says “the guy” called LaBeouf “f–got,” after which the actor reportedly lunged to initiate a physical fight and immediately got punched. A squad car driving by the chaotic scene called for backup.

The bar is allegedly a favorite for LaBeouf and his loyal pals. RadarOnline interviewed “the guy” LaBeouf came to blows with, college student Mark Mastro, who admits using a gay slur and laughing as the actor left the bar, causing LaBeouf to aggressively “charge” at him. Radar obtained a brief, rough video allegedly recording the moment cops detained LeBeouf and placed him, hands overhead, in a police car for questioning.

As Mastro tells it, “My girlfriend saw Shia….I wanted to get a picture with him so I went over to his table, sat down next to him, and told him I was a fan. I called him Mr. LeBeouf.”

“He didn’t want anything to do with me….He said he just wanted to chill and refused to do a photos. I walked away.”

But as the actor crossed paths with the brushed-off fan outdoors, things got surly. According to Mastro, “My friend said, ‘What’s up, Shia?’….Shia told him to ‘get the f–k out of my way.’ He was slurring his words….That’s when I said to my buddy, ‘don’t worry, he’s just a f–cking f–got anyway.’….He turned around, cursed me out, and I started laughing.”

Mastro claims LaBeouf got into his truck near the bar’s front door, but quickly thought twice about turning the other cheek.

“All of a sudden, he jumped out and ran back….He charged at me! I jumped over the patio fence onto the sidewalk to get away from him. But he kept coming after me….He was getting in my face. He was talking sh-t. He was chest-bumping me.”

Mastro does not admit punching LaBeouf, but confirms to Radar that a bouncer broke up the fight and says more than half a dozen squad cars responded to the scene.

LaBeouf rose to fame as a tween star on the Disney Channel, and later became a household name thanks to Michael Bay’s ‘Transformers’ franchise. But he’s becoming equally well-known for his antics both after hours (after a 2007 DUI arrest, he was apprehended while drunk and dazed in a Chicago Walgreen’s in 2008) and during broad daylight (he recently snuck up and dumped coffee on a paparazzo). This summer, he’ll presumably clean up his act for the press to promote ‘Transformers: Dark Side of the Moon,’ opening July 1.

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