The assignment was for a 5th grade class. After checking in, getting the paperwork and key, the admin lady noted a name on the attendance list and told me: "Do not let him use the stapler unsupervised. He tends to eat the staples".
The teacher in the adjoining classroom repeated this warning: They think it's a form of Pica but the doctors are not sure. I had to look it up. It's an actual thing.
"He has actually swallowed some so you really have to watch him. He is not allowed to have staples or a stapler in or on his desk."
This isn't the first time I've experienced weird things kids do. Three years ago there was a kid inserting a rock up his nose to see if it would fit!
As I take roll, I take note which face and desk goes with "staple eater". As the day progresses things go pretty much without incident. I did have to quietly motion to him to not chew on his pencil or eraser.
I did let slide when he switched to the arm of his sweatshirt and later to his thumb. I was pretty sure he couldn't completely swallow either one.