Alec Baldwin -- BANGS INTO CAR ... After Argument With Reporter

Alec Baldwin just got into his THIRD angry confrontation today -- screaming at a female reporter, demanding cops arrest her ... and then hitting a parked car while trying to drive away.

It's unclear exactly what set off Alec this time -- but his car was surrounded by reporters and photographers ... and he yells, "F**k you" to one reporter as he storms away and jumps in his car.

Watch the clip -- after the accident ... Alec wants cops to arrest the reporter he's got the beef with, but as far as we know no one was arrested.

This is getting crazy.

12:15 PM PT -- Now we know why Alec went after the reporter ... his wife, Hilaria, dropped a dime. Watch this clip from FOX5 in NYC, at the very beginning you hear Hilaria say, "That's the one that almost hit me" -- and then Alec goes off.