We had been working on a lot of landscaping, brush clearing, etc and had a large pile of brush which we intended to burn. It was a cool, damp day with fog coming in quick, so there was practically 0 risk of starting a forest fire, and we needed some accelerant to get the pile ignited. Unfortunately, I had run out of lamp oil, kerosene, lighter fluid and couldn't get a hose long enough to siphon any diesel out of the tractor, but, I did have a can of gasoline. Not my preferred chemical for this sort of thing, but I figured if we were careful it would be OK.. Ha!
I poured a fair amount of gas onto the brush pile and went to toss a match onto it right away, but my brother said "Wait a a couple minutes to let the gasoline work its way into the brushpile" -so we did, but what this REALLY allowed was for the gasoline to vaporize, and with the temperature inversion we were experiencing, the fumes then to flow down the brushpile and fill the entire yard up to about 6-12 inches from the ground with gas vapors. So, when I did finally toss a flaming paper onto the top of the pile, the flames shot up, and then down the brushpile, sending a wall of flame across the entire yard in all directions.
It sterilized the ground and the BOOM! shook the house - and other houses for a few hundred yards.
We had begun running away after tossing the lit piece of paper, but the flames along the ground quickly shot right past us, such that we were running through fire. My brother and brother in law were wearing leather boots, but had shorts on, and the fire burnt all the hair off their legs but they were otherwise OK. As I had just been working on the dock in the water, I was still wearing my Teva sandals, and that proved to be the "fatal flaw".
I never use gasoline to start fires any more.

I seldom listen to my brother now, too!