A somewhat related story:
The other day I went to a friend's newly-opened restaurant. The dish I ordered was a Korean one, so it had a ton of peppers and garlic. When I started to eat it, I immediately realized it was a good bit spicier than what I was used to being able to handle. But I didn't want to seem rude in not eating it. So I toughed it out, mouth burning and sweating away.
Later that night, I got the most intense cramps in my lower stomach, I thought I was having a baby (I'm male).
I had to rush my friend to the bar we were headed to, so that I could 'use the stall.' To avoid grossing people out, let me just say that my bowel movements for the next 24 hours or so were urgent, preceeded by cramps, and the stool itself contained what I'm almost completely sure were worms. The only other thing they could have possibly been were maybe undigested bean sprouts, but I hadn't eaten them or anything else stringy in quite a while...