This is one of those times when strict gun laws have failed you.
If that happened here, you could walk out on your balcony and start randomly firing at the gypsy camp until it stopped. As a matter of fact, if I had a camp of gypsies living across from me, I'd probably fire at them even if they weren't shooting fireworks. I've seen the Dateline undercover specials... those people steal way too much shit.
