King Arthur, preparing to go on a lengthy quest for the Holy Grail, asked Merlin to devise a chastity belt which Queen Guinivere could be locked into. However, when the wizard showed his king the device, it had a large round hole in front, which would seemingly allow easy access to the queen's womanly charms.
"Merlin, you fool, this provides no protection at all," Arthur grumbled.
However, the magician handed his liege a short stick. "Push this through the opening and hold it there," he instructed. When the king did so, five seconds later two sharp metal blades slid together in the hole, forcefully chopping the wood in half.
"Wow," Arthur gulped, "That will certainly teach a lesson to anyone tampering with Guinivere." Soon afterward, having received personal promises from all knights of the Round Table that they would respect the queen's marital fidelity, he rode off on his quest.
Upon returning to Camelot two years later, Arthur ordered all his knights to assemble in the courtyard, standing next to one another facing him.
"Drop your pants, all of you," Merlin told them, and they reluctantly did so.
As he walked from one supposedly loyal knight to another, the king became increasingly sorrowful and disappointed, for each man's sexual appendage had been reduced to a stump--except for the last one in line, Sir Lancelot, who stood with his manhood intact in its full glory.
Arthur was touched with deep emotion as he addressed his top lieutenant. "Lance, I should've known that you would be honorable toward my wife, even though I know you find her very attractive. For your loyalty, you can have anything you wish in my kingdom, anything at all, even Guinevere herself--just tell me what your desire is. Speak, Lance!"
But Sir Lancelot was speechless...

--C.K.