Even in the cleanest, safest piercing studios, piercers have seen things that would make anyone’s stomach turn. Think severely infected jewelry, piercings filled with pus, piercings lost in someone’s tongue and clients doing wildly inappropriate things during the piercing procedure.

HuffPost spoke to six piercers on the most shocking experiences they’ve had, and how you can avoid this from happening to you.

The Most Jaw-Dropping Experiences Piercers Have Had

It’s not a toilet

John Johnson, piercer and owner of New Flower Studio in Long Beach, California, has seen many strange things in his studio: “I’ve seen feces on the exam table paper after performing a genital piercing, I had someone fart directly in my face once during a genital piercing, and I’ve even had people orgasm during the piercing procedure” he said.