My maths teacher could circumcise a flea with a board rubber from 10 meters away.
That was back in the day when being a lippy kid had consequences!
There was a kid in my class in secondary school, Meredith, we used to call him 'crippler' as he was a right bruiser.
One day, teacher is at the blackboard writing, and a knife sails from the back of the class, "DUNK" right into the board, about a foot away from the teachers hand.
He didn't even turn round. He just said "Meredith, see me after class."
He got caned. Again....