Alec Baldwin popped up at a pro-Palestinian demonstration in NYC -- and blew a gasket at an anti-Israel protester, prompting police to whisk away the actor before the situation escalated.
Baldwin got into a heated back-and-forth with the man at Monday night's march in Manhattan, which was organized by a Palestinian-led community group, Within Our Lifetime. It wasn't clear if Baldwin was part of the protest or just passing through.
Check out the video shot by NBC ... Baldwin offers a stern look to the man who mentions something about Hollywood -- and condemning Israel for the war in the Gaza Strip.
Baldwin responds, "You've already got your mind made up. I'm in Hollywood?"
The man repeatedly asks, "Is that your answer?"
Baldwin shouts, "You ask stupid questions! Ask me a smart question!"
The man starts screaming again about condemning Israel.