When I was in grade school, virtually all boys carried (real) knives in their pocket. When we were bored we would play mumbley-peg on the playgrounds. No one ever was stabbed or, as I recall, even cut.
I’ve got a nick scar on my right index finger, from playing mumbley-peg with my knife in the school cafeteria during lunch. School nurse gave me a band-aid and said “well that should teach you not to be stupid”. Taught me to pay more attention while playing mumbley-peg is what it did.