This is a video from an Italian fireworks display in which an 'accident' made the entire display go off simultaneously. Obviously, this isn't the first time this has happened and there are always a couple Fourth of July displays here in the US that suffer the same fate. Of course that's not too surprising either when you consider pyrotechnicians, at the very core, are really just people who love watching shit blow up all willy-nilly.
Keep going for the video.
Thanks to RAZE, who agrees this is almost as good as the scene from Dutch where Ed O'Neill sets off all the fireworks at the same time and blows a hole in his coat. CLASSIC.