I am very interested in new writing-methods and their aesthetics. Using a fire-extinguisher to put up a tag has been a bit of a craze in the graffiti-world over the last few years. I don’t think Katsu invented this, but i found his video a good demonstration of the phenomenon. Plus it shows very accurate were graffiti-bombing is about: going out at night to write your name IN HUGE LETTERS wherever it pleases you.