I overheard it when I was 14. I was flying up to Minnesota from Florida to visit some friends of mine, but I was flying on a companion pass since my family didn't have much money and my grandfather worked for the airline. Because of the pass, I had to take an EARLY flight, something like 5:30, and the flight itself wasn't much to speak of: just a little puddle jumper.
I was barely awake, dressed in a suit ("It's the proper way to fly, young man."), and sitting at the front of the plane. In the seat behind me were two older women who were having a very audible conversation that went something like this:
Lady 1: "So we're flying here to see what? Chipmunks?"
Lady 2: "No Martha, CHIPPENDALES."
Lady 1: "...what is that again?"
Lady 2: "Ya know. Those nekkid men who flop around on stage!"
Lady 1: "Ohhhhh yeah!!"
Both ladies proceed to giggle dirtily.
I had never felt so scandalized in all my young life. 😂