Kieran Culkin's hilarious prank on Mark Ruffalo during a stage production leads to an unexpected high and fuels the Succession star's reputation for mischief.
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At 17, Culkin switched out Ruffalo's prop joint for a real one, getting the Avengers star unexpectedly high on set - a prank he later repeated with actor Colin Hanks.
Ruffalo previously opened up about the incident on The Graham Norton Show, but kept Culkin's identity a secret, only referring to him as a 'very naughty young actor'.
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Kieran Culkin, Mark Ruffalo, Phyllis Newman, Colin Hanks, The Avengers, The Moment When, Scott Pilgrim vs. The World, A Real Pain, This Is Our Youth