I enjoy playing football and baseball but watching is really boring. Stuff happens for 30 seconds, 2min break, stuff happens, break, stuff happens... longer break . .. etc.
College ball I can watch on occasion with my dad . . . but NFL? Forget it . . . whole game is spent reviewing every play for some stupid penalty. If I'm going to watch a sport it's soccer or hockey . . . at least there's actually stuff happening, but I'll take Dr. Who, Big Bang Theory and random anime over sports any day.