Firing folded over paperclips from elastic bands was our thing. Bloody lethal things those were.
When I was at school we would use those candy necklaces (little doughnut shaped bits of hard candy threaded onto a piece of elastic)... bite down on one to break it in half whilst pulling the elastic away from your face and you could then release it to shoot the other half off... not particularly damaging compared to some contraptions mentioned here
What a walk down memory lane though! As another person at school in the 90s and early 00s I remember bulldog, slaps/knuckles, bundles, pogs, yo-yos... one weird thing at my Primary school was that we were permitted to play football at lunch/break time but
only with tennis balls (I think because they are much harder to chip into the air)
It is a worry what goes on at schools these days, although in some ways it's not
that different... My parents often recount a story that not long after I first went to school I came home one day and said "Have you guys heard of Jesus?" - my school simply taught religious stuff as if it was fact alongside everything else and kids are pretty impressionable... But my parents are completely non religious and although I don't think they did anything specific to correct me I also ended up not being religious either