About 20 years ago, I watched a friend rehearse songs for a production of "Beehive: The ''60s Musical." One of her castmates had a monologue about listening to Jerry Lee Lewis on the radio; instead, she accidentally said she'd been listening to Jerry Lewis.
If you're over a certain age, you can guess what happened next. The piano player stopped in midsong, the cast burst out laughing, and the music director belted out a loud "LAAAAAADY!"
To her credit, the castmate who slipped up laughed along.