[Ethan Clive Osgoode]

They do that because the kid in the hall stares in at the other kids, makes faces, and distracts them.

Many parents have no idea what what sort of things their kid is really doing at school.

[A_perfect_lady]

Yep. Teachers sometimes know more than parents about what that child is really like. Man, I invited a mom to come into the classroom at sit with her son once, and she came in the back door of the classroom and her boy didn't know she was in there for a minute. He just kept up with his mouth, and his acting out, and his smirking and yelling... really nasty. His mom's eyes just bugged out, and when he turned around and saw her I thought they would both faint.

It's a cherished memory.