Before leaving for a battle, King Arthur puts a strong iron chastity belt on his wife Guinevere and entrusts the key to his most loyal knight, Eddie. Then King Arthur departs.
Five minutes into his journey, King Arthur hears Eddie screaming for him to stop. King Arthur signals his steed to halt and waits for Eddie to catch up.
“Eddie!” the king says, “What’s the matter?”
“Your highness,” says Eddie. “You gave me the wrong key.”