In my part of the world, it's also very common to shoot at celebrations or events. For New Year it's customary to shoot weapons and use whatever firecrackers and fireworks you got. Last year I saw tracer rounds in the air, from AKM fire. There's a lot of weapon leftovers from Homeland War :/
But this...? No matter what your customs are, leaving your weapon unattended is a guaranteed tragedy. This man found out the hard way I'm afraid