That is so horrifying! I remember as a substitute teacher being called early in the morning to go to an elementary school and I didn't mind being called last minute, it's expected. Well, all in one day I have had to call a principal, a guard, and then the child that was sent to the principal's office for wild behavior, was sent back to me and this time while outside she held shards of glass in her hand. It was recess and instead of watching them like normal I found myself backing up from a little girl who was threatening me with a shard of glass...I never subbed there again. The poor teacher probably did not want her day to start off like that.