Vanity’s Julian Sancton asks three Funny People guys — Judd Apatow, Seth Rogen and Jonah Hill — about the terrors and rigors of standup comedy. He tries to answer the question of why some jokes kill and some jokes die. “There’s truly a magic to why we respond to certain people and why they become immensely popular around the world,” Apatow says. “It doesn’t matter how mow many times you work on your act. That [special appeal] needs to be built into your genetic code.”