“Kelly Clarkson!” (The 40-Year-Old Virgin)

Before becoming one of Hollywood’s favorite comedy actors, Steve Carell studied improvisation at The Second City Training Center in Chicago. But the waxing scene in The 40-Year-Old Virgin movie is more than just great on-screen improv. It’s a truly unhinged moment of cinema.

The scene makes for one of the funniest in the movie, probably because it was real. Yes, that’s Carell’s actual body hair being ripped off, and the actor’s painful screams don’t just feel authentic—they are authentic! Resisting the pain, Carell was still able to stutter some hilarious lines, even shouting Kelly Clarkson’s name for some reason.