Kieran Culkin Confesses He's The Actor Who Pranked Mark Ruffalo, Got Him High On Stage

Kieran Culkin Comes Forward As “Naughty Young Actor” Who Got Mark Ruffalo High On Stage

Kieran Culkin Recalls Getting Mark Ruffalo High in an On-Stage Prank: 'I Was 17 and Stupid'

Kieran Culkin on pranks, parenting and why his famous family doesn’t need therapy: ‘Us siblings, we’re already cooked’