I'm definately too old to post here, but I got bored, and this thread reminds me of a similar story.

When I was about 15, my older cousin, a trash man, saved a fire extinguisher he found. It must have been 3 feet tall and a foot across ... weighed a ton. I think it came from a factory. Anyway, he had some .30-06 rounds loaded with armor piercing tips. We took it to an abandoned dump, sort of a valley, and shot it. That sucker took of, flying circles in the air about 50 feet up. It filled the valley with white stuff ... took about 5 minutes to clear. It was AWESOME! I'll never forget that one.