Another graveyard shift story-
This was many, many years ago. A guy came in wearing a baseball cap, glasses, sandals, one of those half t-shirts, and a g-string. He was followed by another guy who was giggling and carrying a video camera. This was back in the days before smart phones and (fortunately) the internet as we know it.
Videotaping was not allowed in the store, but since there was no way of it getting out for the world to see, I didn't stop him and just went along to see how it all played out.
The guy in the g-string strutted (like he had anything worth strutting) back to the pop section of the cooler. I kept a straight face. It just about killed me, but I managed to look bored.
He brought his pop to the counter and gave me a $10. I gave him his change. He held the coins in his hand but put the bills in the g-string, saying, "I like to keep my bills in here."
You know how you always think of something funny to say when it's too late? Yeah. I'd been keeping the perfect straight face, but the perfect comeback was out of my mouth before I could stop it.
As soon as he tucked the bills in the g-string, I said, "Good thing they're small bills."
His friend was doubled over laughing, unable to tape. The guy turned beet red and I had to crack a smile.
Wanting to let him off the hook, I said, "Is this for a bet or dare or something?"
He chuckled and went back to the same strutting-type personality he had before and said, "Why no. Why do you ask?"
They left laughing. I smiled and had fits of giggles for the rest of the night.