When I was in second grade (a year or two ago,) my art teacher, Mr. Snell, lopped off the tip of his finger with one. My Mom was the "Room Mother" that day and wrapped his fingertip carefully in wet paper towels so it could go with him in the ambulance. I don't think they were able to reattach it because his finger was oddly shaped from then on. Either it didn't affect him much or he downplayed it for us kids, because he was an awesome art teacher all through elementary school.
EDIT To Add: - Hey, I remember Room Mothers! I was SO disappointed when my own littles' school didn't allow them.

