SAN DIEGO, CA - JULY 11: Actor Daniel Radcliffe attends SiriusXM's Entertainment Weekly Radio Channel Broadcasts From Comic-C
Vivien Killilea/Getty Images for SiriusXM

Reading through Daniel Radcliffe's recent Q&A with GQ, you can't help but think, Damn, this dude is super down to earth for someone who played a boy wizard for most of their life. Talking about his latest film, Swiss Army Man, in which he plays a corpse, the actor is extremely humble about the parts that he's taken post–Harry Potter.

Since Swiss Army Man, which prompted some walk-outs when it premiered at Sundance, has been more commonly known as the "farting corpse movie," it was only a matter of time until the GQ interviewer asked about the grodier parts of showbiz. And, as it turns out, Radcliffe admitted that one scene in the movie required a cast made of his rear end:

GQ: There's a sequence in the beginning where he has to ride you, so he's sitting on top of you but you're also in the water. How do they do that? Did they have to put a jet motor near your crotch to simulate the farting?
Radcliffe: I'm conflicted to how much to reveal about this, but Jason Haima, who's our makeup chief…he made a prosthetic, uh, butt that had a pipe in it that you could blow air through. So that's how that worked. I don't wear the prosthetic butt. The prosthetic butt is cast and modeled on my butt, and then they film on that one really close in.

Radcliffe then explained how he had to get his "dick and balls out of the way" while they poured the cast over him, going into full detail: "It's actually not too bad on the hairs, but you do want to keep your junk out of the way," he said.

This isn't the first time he's had a mold made of his body parts. He revealed that while filming the Harry Potter movies, he had his face, arm, teeth and full body reproduced for the sake of movie magic.

Read the complete GQ interview for more about farting corpses. Next up, an interview with Harry Potter–themed bands: