Surgeon. anaesthesiologist, really the entire OR staff.
This is more personal anecdote but it was such a consistent image that I now believe they have to be kinky in some way or another.
I had to have some surgery for setting a fracture and as I was waiting for it to happen I had lots of conversations about it, in anticipation of this new experience I am about to have. What people told me was along the lines of "Yeah be on the watch for surgeons - they don't care about you, they just wanna cut someone open". I took it with humor but as I lied there, exposed, on the surgery table, IV and all, I heard a person enter the room. He was obviously highly motivated and enthusiastic, clapped his hands exclaiming "YES! Let's do this operation!" so that's that.
At the same time the anaesthsiologist got to work on my arm. To me it felt as though my arm was slipping off the table, to which they responded "Oh no, you're not going anywhere.". As they started the IV there were such remarks like "Oh now I'm pushing something so you won't puke all over our OR" and "Okay this is going to either feel really good, or really bad!". The last thing I remember speaking out loud was "BAD!" and I am so sure that put a grin on their face.
Oh also physical therapist. I am not even speculating here, she showed me some techniques that really had nothing to do with my therapy. Also had some fun with another therapist (trainee). As he was going to town on my body, kept naming all the bones involved by their medical name. Also blood vessels and such. Honestly I don't even know half of the things he referred to lol.
Martial arts instructor. Also not speculating, it's what they told me. Literally "To do this, you *have* to be a little sadistic", the enthusiastic kind.