We had a first grade teacher who grabbed a kid by the back of the hair and repeatedly slammed his head off the desk. Happened a few times. Tied another kid to his chair and didn't let him go to lunch. She'd slam her apple pointer inches from your face, at least until she broke it one day.
But it was first grade. We knew it wasn't right, but just not how wrong it was.
Why a POS like that ever wanted to teach kids is beyond me.