Former Harry Potter actor Rupert Grint might be playing a drug dealer in London, but his former co-star, Shia LaBeouf, is reportedly the one who knows a thing or two about drugs.

Grint will make his theater debut with Mojo at London's Harold Pinter Theatre as a drug dealer named Sweets. The role made the 25-year-old actor reminisce about a time when he was close to drug use in real life.

According to Grint, LaBeouf took LSD while on the set of the 2013 film, Charlie Countryman.

"He smashed the place up, got naked and kept seeing this owl," Grint said in an interview with The Guardian.

According to Grint, LaBeouf, 27, was all he needed to learn to say no to drugs.

"If anything will make you not do drugs, it's watching that," Grint said.

Recently, LaBeouf took to Twitter to continue, and quickly end, a feud with Jim Carrey, 51, in less than 24 hours.

"Dying is easy. Comedy is hard. I believe it was Shia LaBeouf who said that. So young, so wise," Carrey said jokingly while presenting at the 2014 Golden Globe Awards on Sunday.

The next day, LaBeouf offered Carrey his response.

"If you explain @JimCarrey you've killed him, Nobody knows if it's for real or not. That way he's immortal," theTransformers actor tweeted early Monday morning.

About two hours later, LaBeouf uploaded a music video from Carrey's daughter's band, The Jane Carrey Band, and gave his assessment of Carrey as a father.

"At least I don't get arrested for indecency on major LA highways! Or abandon love child's," LaBeouf said according to E!. 

The offensive tweet, however, has since been deleted, and LaBeouf quickly changed his tune the same day

"Jim Carrey states that he is deeply involved in his daughter's life - I accept that, regret tweet on the matter. Apologies to both parents," LaBeouf tweeted an hour after uploading the music video for "Simple Beauty."

Grint will appear in Mojo for eight appearances a week.