>Although I have never actually tried using "unshaken"
>extinguishers as a test,  I'm not going to wait for a fire, before I shake
>my extinguishers.  This may be another good reason to consider Halon type
>extinguishers.

And bystanders wonder why the crazy man is waving his extinguisher
around and shaking it while his van burns...

...some sort of primitive appeasement to the fire gods?