Our filthy computer

We had to replace the CD-ROM drive and as long as we had the case open, added some memory.

Whew! was it ever dusty in there!

So off we went to Wal-Mart for a can or two of compressed air.

None to be found. None in the back, none at the front.

None at Rite-Aid or CVS. None at the various dollar stores.

How and why did the whole town run out of canned air?