A Knight was getting ready for the crusade.
Ha turned to his friend and told him:
"My fiancée is the most beautiful girl in the world and I can't imagine her being with someone else, while I'm gone. You're my best friend and I trust you. Here's the key for her chastity belt. In case I never get back, unlock her and set her free."
When the crusade Knights were a mile away from the village, the Knight gets an urgent message:
"Mate, You Gave Me The Wrong Key!"