GM: "Luck roll"
PA: "Natural 20!"
GM: "You're lucky, you found a whole dollar!"
PA: "Boo ya, I pocket the hell out of that!"
GM: "While you pick up the loose change you notice a couple of street toughs walking with menace in your direction. One has a tire iron."
PA: "Great day in the morning! Forget the dollar, I leg it to the nearest ally and change into my eagle form!"
GM: "You aren't playing a were-eagle you're just a-
PA: "Bully to that! I'm changing my character sheet!"
GM: "I will ...