When I was a kid...
I had a rich friend whose father bought him and his brother some theatrical-quality prop guns to play with. I think they were called "blowback guns" or something; they fired some type of blank ammo for use in theatrical plays and whatnot.
So these two knuckleheads start chasing each other around a Dunkin' Doughnuts in New Jersey, blasting away at each other. Everyone inside panics, thinking it's some kind of bank robbery type thing (this was back before gangs were the Big Thing).
The police are of course called. My friend happens to notice an entire line of patrol cars sneaking up on the Dunkin' Doughnuts, and the guys hide the toy guns in the back of his beat-up car.
The cops were NOT amused. They confiscated all the "guns", arrested the two guys, made their parents bail them out, and fined them, I think for something like criminal stupidity and wasting police resources (whatever they actually called it).
He never saw the "guns" again, but he got a good story out of it.