I Love You, Man (2009)

Sydney Fife: Society tells us we're civilized but the truth is we are animals. Sometimes we just have to let it out. Try it.
Peter Klaven: Baaah!
Sydney Fife: Good. Now gently remove your tampon and try again.

Trivia: J. K. Simmons plays Paul Rudd's father in the movie, even though in real life he's only 14 years older than Rudd.