I didn't but I remember an old female class mate of mine (kind of) did.

Felt sick, asked the teacher to call her mom to pick her up. We could see them walking to their car through a window and she threw up into some bush. Her mom handed her a mcdonalds paperbag and they got in their car and left

Weird chick

No but I almost fainted once if that counts.

nah man not me, there was this one kid who passed out though. middle of biology where the class is dissecting a frog this cunt passed out flat on his back and starts vomiting into his mouth. I of course stood by and waited for someone else to do something, took a good 10 seconds of everybody watching for someone to turn him on his side
can't even imagine how he still sleeps at night knowing 20 other people will be reminded of that humiliating event on a monthly basis. sucks to be him