Josh Peck compared acting with Ben Kingsley in The Wackness to playing basketball with Michael Jordan.

Still, perhaps more daunting than that task may have been the sex scenes he had to share with co-star Olivia Thirlby.

"It was petrifying. I was afraid when the robe dropped, so would the sky. The world would come to end," the actor told ReelzChannel. "It was a funny day. We kind of didn't talk to each other for the whole first half of the day and then when we had to shoot it I don't think I had any lunch. I didn't want to be bloated. I did 50 push ups, dropped the robe and went with God."

Josh Peck plays Luke Shapiro - and gets naked! - in The Wackness.

Should it really come as a shock that Ghandi doesn't do drugs?

Sir Ben Kingsley - who an Oscar for his portrayal of the spiritual and political leader - reportedly had to be shown how to smoke pot for his role in The Wackness.

Kingsley stars as a marijuana-addicted therapist in the film, but director Jonathan Levine told the New York Daily News that the actor had to be given instruction on how to make his inhalation look realistic.

"I had to teach him how to properly hit a bong," Levine said. "It's kind of like herbal tobacco. It doesn't taste great or smell great, either. I felt bad for everyone's lungs."

Ben Kingsley is 64 and an Oscar winner.

Mary-Kate Olsen is 22 and really thin.

Still, the veteran actor recently told People Magazine that the former Full House star was "completely in charge" of the on-screen smooch between this odd coupling in The Wackness.

Writer/director of The Wackness, Jonathan Levine, said that although he was never a drug dealer, the movie is loosely based on his own experiences growing up in New York.

Even with this all-star cast, Levine still passed along a few valuable lessons. Most notably?

"I did have to teach Sir Ben how to take a bong hit," Levine said.

Josh Peck is a young actor, currently appearing in The Wackness alongside Ben Kingsley. Below, Peck speaks on the film:

Q: Do you see this movie as being another step forward as an actor?
Peck: I think in any case it was a step up as a human being to be surrounded with such unbelievable talent, I mean, Sir Ben has been my favorite actor my whole life since I can remember loving acting and appreciating the craft and he's just been my favorite just getting to have this experience at Sundance with everyone in the movie, it's been such a great life experience.

Q: Did Jonathan already have Sir Ben cast in the role of Dr. Squires? What about some of the others?
Peck: I think Sir Ben was really the biggest draw in addition to the script. I remember in preparation for the movie, I was working with my acting teacher and she just said, "When you do this movie, you have nothing to worry about because Sir Ben doesn't need to do a movie with a blasé director or a so-so script."

When you're at that level, it's picking fine material, so just to be a part of it was a complete honor.

Read the full interview with Peck now.

The Wackness is one of the best reviewed movie at this year's Sundance Film Festival. It's also one of the more interesting, due to its casting:

Ben Kingsley and Mary-Kate Olsen somehow star together in the film.

The story is set in 1994 and centers on a troubled teenage drug dealer and a drug-addled psychiatrist. The former trades pot for therapy sessions, then falls for the doctor's daughter. Interesting, no?

Oliva Thirlby, who we loved in Juno, also stars.