When I was a stupid/silly kid, the most offensive weapon we could use in the classroom was ~:

Tear out half a page of your exercise book. Put it in your mouth and chew. Spit it oot. Get your ruler. Place wet paper on the end. Bend ruler backwards and………Let Loose.

Fluff. It could travel across a whole room and hit the intended target. Without fail.

Childish?

There was a “school reunion” here a few years ago.

I did NOT attend. My “crimes” are multiple and remembered :o(