Ever imagine how it is like to be in the heat of danmaku battles? When I say "heat", I mean real heat aka fireworks. And these guys in the vid below will show you why danmaku is called "bullet hell".
In case you didn't know, they're cosplaying as Reimu Hakurei and Izayoi Sakuya, both from the Touhou series of shooting game. In the game, they shoot bullets that looks like a fireworks display.
I guess they can't use a big fireworks or they will be in real problem.