Joaquin Phoenix continued his erratic behavior after jumping off stage to confront an audience member during a short performance at a Miami Beach nightclub last night.
Security guards had to drag Joaquin back on stage and escort him away after he came face-to-face with a heckler in the crowd.
"We have a (double expletive) in the audience", Joaquin belted out before jumping into the crowd.
It was not immediately clear whether the two men exchanged any blows.
Security guards swarmed the scene and dragged Phoenix away.
Hundreds of people packed the nightclub at the Fontainebleau Miami Beach hotel after the doors opened at 10 p.m. Wednesday.
Several of those in the audience said they came just to see Phoenix, who kept them waiting for almost four hours.
A scruffy Phoenix finally came out on stage around 2 am, smoking a cigarette and wearing a disheveled dark suit, sneakers and taped-up sunglasses.
He began rapping to a beat played by the DJ and nodding to the music, although most of the lyrics were unintelligible.
That's when he responded to someone heckling him in the audience near the stage.
The incident is the latest in a string of bizarre antics by the Oscar nominee.
Last month he stunned David Letterman into awkward silence when he gave abrupt two and three-word answers and sat with his head bowed during an interview to promote his film Two Lovers.
His strange behavior has left some speculating that it is all part of an elaborate hoax.