I am not sure why, but this story, from a few years ago popped into my head. This story fits this topic perfectly, and it is gross, you have been warned...
On day, in our photo lab, it was just me and the male Asst. Manager, and Andy. I'm not sure how this was started, but Andy, who is a hunter, said something along the lines of..."I'm a hunter, I've drank deer blood, you can't gross me out."
Asst. manager and I look at each other, and he says, "Challenge accepted."
A few subjects were hit upon, with Andy repeating, how he couldn't be grossed out.
Asst. Manager and I settle on a woman's period. We were being unsuccessful, when describing length and heaviness of flow, in grossing him out, so Asst. Manager brings out the big guns...clots.
You have been warned, it gets really bad after this.
Describing, what they looked like to Andy was have a minute affect, however, when I said, you can feel them slide out, he turned an amazing shade of gray/green and told us to stop, he was going to throw up.
Asst. Manager and I high-fived each other.