Wladimir Klitschko -- THREATENED BY BATMAN (VIDEO)

Hilarious moment at a news conference for Wladimir Klitschko's next boxing match -- when his opponent stormed the room in a Batman costume ... and then beat up a guy dressed as the Joker.

It all went down in London Wednesday -- when Tyson Fury pulled up to the event in a sick yellow Lamborghini ... in full Dark Knight gear.

Fury -- who's set to fight Hayden Panettiere's baby daddy in October -- ran around the media room like a lunatic ... before issuing a threat to Wlad in his best Batman voice.

Eat your heart out Ben Affleck.