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Kieran Culkin Admits He Swapped Mark Ruffalo's Prop Joint for Real Marijuana When He Was 17: ‘I Thought This Was a Good Prank. I'm Stupid'
Mark says, ‘I haven't smoked pot in 10 years. The second half's going ... we slipped a real joint onto the prop table," Ruffalo said at the time. "Between the two of us, we smoked a giant ...