King Arthur was heading off for the Crusades when he called one of his squires and said, "Here is the key to Guinevere's chastity belt. If in ten years I haven't returned you may use the key."

His Majesty crossed the drawbridge and set off along a long, dusty road. He stopped, turned his horse and took one last look at his castle.

Whereupon the squire rushed toward him yelling, "Stop! Your Majesty! Thank goodness I was able to catch you. This is the wrong key!"