The pass interference penalty is out of whack. What other penalty can net 39 or more yards? Roughing the passer? Unsportsmanlike conduct? Using a helmet as a weapon? I don't think there's any other penalty as severe as pass interference, yet it's unchallengeable and inflexible. Even when it benefits us, it isn't a great way to move down the field. At least it should be challengeable, and maybe it should be a 15 yard penalty, with additional yards for unsportsmanlike conduct.