"Mark says, 'I haven’t smoked pot in 10 years; the second half’s going to be so much fun,' " the 'A Real Pain' actor claims Paras Griffin/Getty; Monica Schipper/Getty All the world’s a stage! Kieran ...

All the world’s a stage! Kieran Culkin, 42, opened up in a recent interview with The Guardian about getting Mark Ruffalo, 57, high while they were in a play together by swapping a prop joint for ...