I used to be a receptionist/apprentice piercer at a piercing and tattoo studio.
This guy came in and insisted that he needed an ampallang (advanced genital piercing for those who don't know), and that I needed to do it. (Editor's note: don't Google that word without bracing yourself!!)
There was twenty minutes of explaining that I was not trained to do so, plus the shop had a policy of the male piercer pierced men, and women pierced women (a couple exceptions occurred, but it was at our discretion). Eventually, he finally let up.
Then he sent the place a letter like a week later talking about how amazing I was.