Was playing Trivial Pursuit with family one time, classics question came up. My brother replied "Pericles". His 10-yo daughter said "Wrong!" He knew he was right & demanded the "correct" answer.
"Testicles." Pronounced to rhyme with Pericles. It was the answer to another question on the card - What is removed from a horse to make it a gelding?
The poor child. Her face as we all screamed laughing. "What?!?"
My favourite joke, being the only one I can remember. Still gets a laugh!