The contents of the extiguisher are entirely
immaterial.
The extinguisher is just there to act as a propellant so
that you can amuse yourself pushing burning cardboard
boxes and/or burning wastebins around while awaiting the
professionals. They bring huge hoses so they can make
the burning stuff really fly :-)
And Water Can extinguishers are for chasing people around and soaking
them on hot days (or in the dead of winter).
And CO2 is used to chill beers, and spray at probies to watch them scream
like little girls. (or at the probies girlfriends to give them hard
nipples, insuring that they will never return, and we will all later
bitch, while drinking our chilled beers, that we can never get women to
hang out at the station).
-chris
<http://www.mythtech.net>