PartyLines- photographs by Patrick McMullan

How did you prepare to play a caveman? “I ate a lot of prehistoric food. You know, mutton. I drank from rivers … raw fish, and a lot of sushi.” —Jack Black

—Gia Carides

What's the most caveman thing about you? “I'm glad you asked. My muscular build.” —Michael Cera

—Oliver Platt

—David Cross

You play Isaac in the film. How did you get into character? “I studied a lot of baptisms and brises and watched a lot of babies get circumcised.” Are you circumcised? “Come on! I'm Jewish. Yes. That's the most awkward question I've ever answered.” —Christopher Mintz-Plasse

—Amber Tamblyn

—Horatio Sanz

What did you do to get into your cavewoman character? “I didn't shower for months. I just really started to realize that I still have hairy armpits, and it's totally natural and totally sexy to have hair on your body.” —June Diane Raphael

—Lee Eisenberg

What have you learned by working with Jack Black? “Not a damn thing. I just sit at home with my bong in my shorts and watch YouTube. And Jack said, 'Hey, we can take over the world if you get off your ass.'” —Kyle Gass

—Zoë Kravitz

—Ed Helms

You play a Shakespearean character. Was your audition hard? “I had to go all the way and glue a little Thracian beard onto my chin. I walked into the casting office and they go 'I can't believe you have that beard, it's perfect!' I was like, 'Yeah, I grew it.'” —Xander Berkeley

—Anthony LaPaglia

How did you get into your caveman character? “I dumbed down. Listened to the beating of the drums. It was tough.” —Matthew Willig

—Jeff Garlin

Have you ever dealt with any on-set pranks? “Billy Bob Thornton likes practical jokes. He got me one time when he said 'My colostomy bag broke. And I've soiled my costume.' As a director, my thought is 'That's gonna take an hour, and we're trying to shoot a movie.'” —Harold Ramis

—Rick Overton

What was the craziest thing Jack Black did on the set? “He once sang a song about his armpit.” —Juno Temple