‘Birdman’ Keaton busts up real-life basketball brawl!

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“Birdman” MICHAEL KEATON belatedly realized he coulda got his wings clipped BIGTIME for making like a real-life superhero – not merely one nominated for an Oscar – when he busted into the middle of a fist-swinging basketball brawl and bravely ordered beefy, overheated wannabe studs: “BREAK IT UP!”

Walking along Venice Beach, the 63-year-old star stopped to watch a pickup game, and when a fight broke out, our 5-foot-9 hero instantly waded between the two teams and – even though totally dwarfed – got all ballsy, taking control and calming everyone down.

Now my KICKER: Michael then stuck around and refereed the game!

But later, he told a pal who’d eyewitnessed all: “Don’t EVER let me do that again!”