I don't know exactly how they get there, but they do, and it's miserable until you can get to the bathroom and get it out.
But when you're in elementary school, you can't just go to the bathroom whenever you want. ("That's what recess is for!")
One time. when I was in third grade, I had a really terrible hair in my butt. It was made worse by the fact that I was wearing leggings, and I just couldn't wait until recess to go get it out. So when I thought that no one was looking, I reached my hand down the back of my pants and got that butt hair out.
But of course, to my horror, what do I hear from across the room?
"Megan's itching her butt!"
I felt as stupid and useless as a hair stuck in a butt crack.
And the kid's name was Ty. I remember him because he was pretty much bald himself and I was bothered by the fact that his name didn't have any proper vowels.
I'm sorry if you were offended by this post. But this is a true story, and the world needs to know that butt crack hairs are the worst, and there are millions of men and women with long hair who have to deal with this misery.