But why did the Iron Man lose his cool?

Robert Downey, Jr. is probably what you'd still call "in recovery," which makes this episode all the more strange and random...

We caught up with the brilliant actor last night outside Nobu in the 'Bu (along with his wife and another couple) and our photog only asked him a question or two before Downey inexplicably charged the cameraman.

WTF! Just being playful and it got weirdly out of hand or was RDJ just in a really bad mood? Check out the vid above and see for yourself!