never done it, never seen it - but i did have one female teacher ran out of the room and come back 10 minutes later..... with a sweater around her waist

we wondered what had happened, she ran so fast - turns out she had her period oOo:

being a teacher myself, i've felt like crying, but never have - instead i smack the kid around a bit or drag him / her to the office for the principal to deal with