Years ago a friend, when a teen, built himself a fully-functioning catapult (Roman style). It would fire half-bricks about 200-300m from his balcony down into a wooded gully. The gully was in the middle of a housing belt ... It was really really coool watching the bricks fly through the air and crash down into the foliage.

But it was waaaaay dumb. An accident waiting to happen. And it didn't involve any chemicals, explosives, small animals, etc. Suffice it to say, he grew up to be an architect.

There is no legislating for stupidity.