Comedy and horror are cousins; they're related. They both come from storytellers who want to specifically affect the audience and elicit specific reactions during the movie.
Jason ReitmanLook, any guy who tells you that he didn't have some fears is lying. Of course, it's scary becoming a dad for a variety of reasons. That's not to say it isn't thrilling. It was. It was very exciting and in some ways was the greatest thing that's happened in my life. But it's also completely terrifying and you're saying goodbye to a portion of your life and that's just an emotional experience.
Jason Reitman