Guts - is arriving home late after a night out with the guys,
being assaulted by your wife with a broom, and having the guts to
ask: "Are you still cleaning, or are you flying somewhere?"

Balls - is coming home late after a night out with the guys,
smelling of perfume and beer, lipstick on your collar, slapping
your wife on the ass and having the balls to say, "You're next."