Cardboard tube fighting is so passe. All the tough guys are now taking their sporting conflict to the streets with fluorescent tubes. At least in Japan.
Once, at work, after replacing a dead bulb I thought it would be fun to swing the old tube around and ended up whacking it on the big bin outside. They shatter like crazy. I can’t imagine this being good for one’s health.
Some of the pictures at this link are a little disturbing. This is the least disturbing of the bunch.