I saw this episode too. They tried pretty hard to get it to ignite,
but couldn't. But I don't doubt that with the right vac under just
the right conditions it could explode. And of course anyone doing
this with a shop vac is an idiot.
Reminds me of a teacher back in high school. He decided to use a shop
vac to suck water out of his swimming pool, which might not be such a
bad idea, if there was a small amount on the bottom of the pool. But
he did it by taking the top part of the vacuum and holding it while
standing in the pool water, thereby electrocuting himself.
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