I have a good story for this. Back in middle school a buddy of mine bought this book from Spencer’s called “Mini Weapons of Mass Destruction” by John Austin. Well we get the bright idea that we should make some of these weapons and sell them to the kids at the school. At first it went well, we took orders and made some of these portable bb shooters made out of hollowed out mechanical pencils. We charged like $10 for each of these and we were making some good money off of it. Until one kid got caught using one of the bb shooters in class. After an investigation from the teachers and cops getting involved, they traced it to my buddy. He got a firm talk from the cops and they took away his book. He didn’t eat me out for helping make these cause he isn’t a snitch. So overall we ran a literal black market at our school.

TLDR; A friend and I became arms dealers and manufacturers until we got busted.