Jonah Hill did a big boo-boo while on the Late Show with Conan. He dropped the F-bomb on live television. That's a big no-no as you guys know.
Just last week, Joan Rivers got kicked off a show because she dropped the F-Bomb. We don't know why, but networks take cursing very seriously. Why is cursing not allowed on a late show? Kids should be sleeping by that time anyways.