King Arthur was about to embark on a long crusade. Before doing so he called to Merlin to devise a cunning chastity belt for Gwenivere. The belt contained a miniature guillotine.
Upon his return, he called to his Knights of the Round Table and had them all strip from the waist down. One by one, he went to each knight and shook his head, telling all those whose members were missing to get out of his sight.
That is until he came up to Lancelot. Seeing that Lancelot was intact, he exclaimed, “Now I knew I could count on you to be trusted. Name anything at all and it is yours.”
Lancelot replied, “UNGH! UH! UNGH!”