While it's not really funny I can see where the terror lies for you.
I was trained in all this stuff. There is a fellow I work with. He once bought a can of CS spray at a swap meet. Then promptly took it out and tested it. He pointed the can away from him and let loose a burst, to make sure the can functioned. Unfortunately for him he forgot to check the wind direction.
LOL
I later informed him that he was a Dumb Ass.
To which he replied ... Gee Thanks.
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The line between good and evil is razor sharp. Be careful of misteps,
lest you find yourself spitted upon your own blade.