“I was young.

I know better,” he said.

It was during the 2000 production of James Lapine’s playThe Moment Whenwith Ruffalo and Tony winner Phyllis Newman.

Kieran Culkin and Mark Ruffalo

Kieran Culkin and Mark Ruffalo.Credit:Lia Toby/Getty; Chelsea Guglielmino/WireImage

I believe its happened, he recalled thinking.

At that point, he felt regret.

“I’m like, ‘I thought this was a good prank.

Kieran Culkin attends the BFI presents “A Real Pain” preview and Q&A at BFI Southbank on December 12, 2024 in London, England.

Kieran Culkin.Joe Maher/Getty

Oh my God, I’m so sorry,'” he said.

“But actually, they loved it.

There was this other actor who had never smoked pot in her life.

Mark Ruffalo

Mark Ruffalo.JC Olivera/Getty

She goes, ‘Is this what being high is?

This is lovely.’

And then Phyllis Newman comes in and goes, ‘I havent smoked pot since the 1960s.

Thank you, darling.'”

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“I just went, ‘Oh s—.’

The girl that I was passing it to had never smoked pot in her life,” he continued.

“I had, up to that point, smoked a lot of pot.”

“It was the worst thing I ever did.

“I was young.

I know better,” he toldThe Guardian.

“I’m not going to attempt to get anyone high on stage.”