Dh got the belt just once in his school career: at secondary school, where the class was told by their (Maths?) teacher on a Monday morning that the next time they saw him, they must have thier books covered. Fine, they thought - we don't have Maths again until Wednesday.
Except that the (English?) teacher was off and the Maths teacher was covering for him that afternoon. So the entire class, bar two boys who had home lunches and therefore been able to cover the books at lunchtime (this was a grant aided state school that took kids from all over the city, so most couldn't go home at lunchtime), were lined up and given the belt for not having covered their books "by the next time they saw him" 

The bastard knew that morning that he would be seeing the boys in the afternoon and was setting them up to fail.
:(
That's nothing to do with discipline and everything to do with sadism.