A friend of mine interested in model rocketry demoed a sun tracking model rocket at a state convention. Pretty soon after, he had a chat he described as "terrifying but friendly" with "a few dudes in windbreakers" who wanted to know what he was up to. He didn't get into any trouble but decided he'd stick to unguided rockets from then on.

Between that and playing spot the fed at the local machine gun shoot, I was surprised at just how much attention the state pays to these kind of hobby conventions, but I guess I shouldn't be.