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VIDEO: Matt Damon's Inner Demon Attacks Adrian Grenier

Matt Damon is one bad director. He completely freaked out at Adrian Grenier while filming Adrian during a PSA for his own charity, — or did he?

Filmed from the set of Entourage, Jeremy Piven attempts to break it up, but there was no stopping Matt from going off.

Is this a real or fake blow-up to draw more viewers to Entourage and give more donations to Damon’s charity? It’s either great acting or actors behaving badly.