Our Sister Something would distract us with that ruler and then swing a sock filled with rolls of dimes at the backs of our heads. When the “stars” finally cleared and we were able to get off the floor, we wouldn’t know what hit us. How she got away with a swinging-sock thing is still a mystery. Father What’s-His-Name just smiled and approved, everytime. LOL.
It sure let you know where the lines were, and it was up to you from there.
The permissiveness of today's school environment would never have been tolerated, and I think the difference is readily apparent to anyone who will look.