Remember when water came to the door in 5 gallon GLASS bottles? We found one of them in the vacant lot behind my house. It smelled of gasoline, and had about 1/4" in the bottom. As a pre-teen, I thought nothing of putting a match up to the edge...
When I did, a flame shot out of the top of the bottle about 3 feet high. It was loud, like a jet fighter going over. I was about 12 inches from the bottle the whole time. It did not shatter. I walked away, twitching the whole time at what could have been.
Lesson learned.