Tech Support Pits:

From Martin===
Dear Webby
I know you have long badmouthed and condemned the use of
compressed air for computer cleaning, without ever stating
your real reason. The kids already know and talk about it.  
Maybe it's as well that the parents and grandparents do too.  
(Yeah, I know, there are plenty of adult 'bone-heads" who 
would abuse them if told.
Martin
http://www.truthorfiction.com/rumors/d/dustoff.htm

Dear Martin
Yes, it is true that stooopid kids inhale the compressed 
"air" from those silly cans that are sold to bozos to blow 
dirt and small parts to harder to reach places.
Here is an easy to read article about it:
http://www.snopes.com/toxins/dustoff.asp

Techs have known or suspected for a long time that those
companies like Dust-Off just ship their toxic waste gases
all over the country, to get rid of them anywhere but in their
own back yard. We have also known for a long time that
a certain percentage of kids will sniff anything from 
gas to glue, if some other kids tell them it will make them
experience something strange.

So, since you now know that Dust-Off and similar cans of
compressed "air" contain toxic waste gases, supposedly
as a propellant (which is a total lie. Real compressed air
does not need a propellant), and that dumb kids sniff that 
stuff, don't bring it into the house.

For the same cost as a large can of toxic waste gas 
propelled industrial air, you can get a small rechargeable 
battery powered vacuum cleaner and get rid of dust bunnies
instead of blowing them underneath heat sinks and other
hard to get to places.

If you do feel the insane urge to blow dust from the 
computer all over the house, put the crevice tool onto the
hose of the vacuum cleaner and plug the hose into the
wrong end of the vacuum cleaner. 

Have FUN!
Dear Webby