I personally thought that “Suffer the little children” was one of the creepiest. It had a very realistic sense of grudge a person might hold against their superiors: teachers/bosses and would wish only if they can scare the hell out of that person or teach him a lesson.
In turn it also plays on the mind of the person who is making his subordinates suffer…plays on the sense of guilt a mean superior definitly has inside his mind.
Can be made into a spooky real spooky flick if not already.