If you should happen to acquire a Class-A large metal fire extinguisher…Do not use a pipe wrench and take off its cap (being sure to keep the cap connected to the long spine that reaches into the extinguisher as you remove it)

Do not dump out the powder from inside the extinguisher.

Do not get any cheap bucket of water-based latex house paint and mix (before putting in the extinguisher) with water at a 1:1 ratio.

Do not pour the paint into the extinguisher and seal the cap back tightly.

Do not  use a bike pump or use the air pump at a local gas station to fill the pressure valve (under the gauge on the side of the handle) with air.

Do not spray huge fucking tags all over the city.

That would be illegal. Grafitti is a crime…and not For The Kids.