It's the 4th of July and it's a day for fireworks in the U.S. of A as they celebrate their independence day. This also means being aware of the hazards of handling fireworks and here is a video from the U.S. Consumer Product Safety Commission scaring you with a safety video they posted last year. Whether celebrating an event or making some pyro devices for airsoft use, if you are not competent or skilled to handle such, better avoid handling pyros.
So have fun today and stay safe.