At the risk of being SEB-ed (this may have been done before my time on here), we've all heard about people having guts or balls but what's the difference? In an effort to clear up any confusion, the definition for each is below.
GUTS - is arriving home late after a night out on the lash with the lads; being assaulted by your wife with a broom and having the guts to ask "Are you still cleaning luv or are you flying somewhere?"
BALLS - is coming home late after a night out 'with the lads', smelling of perfume and beer; lipstick on your collar, slapping the missus on the arse and having the balls to say "You're next..."