Shia LaBeouf Chased Around a Homeless Guy Hours Before Arrest

As for the threats to law enforcement ... Shia reportedly told police, "I'll f*** you up."

Police came and arrested the actor and took him to the cop shop. Shia was charged with criminal trespass and disorderly conduct.

Shia pled not guilty Friday morning and left the courthouse a free man.

Shia LaBeouf looked like crap as he left the courthouse Friday ... after being arrested for essentially going insane inside Studio 54 in NYC.

Shia had remorse and hangover written all over his face as he walked away, just having pled not guilty to criminal trespass and disorderly conduct.

Shia allegedly threatened cops, yelled obscenities at patrons inside the club and disrupted the performance. He also gabbed an ass or 2 during his drunken tirade.