Hey, I got one that I saw, but wasn't me that it happened to.
About 3 years ago I was over at my uncles house watching him work on his 71 mustang. As I recall he was at the time replacing a broken (or so he thought) motor mount. Turns out the mount itself was fine, just the rubber grommit type thing that insultates it was dry and cracked, so he got a replacement grommit, and proceeded to wash off the parts... in kerosene. Now, I'm told that lots of people use gasoline and kerosene to clean parts, they make great solvents, but then, after he finished replacing the mount, he went outside to light up a cigarette, and the fumes from kerosene on his hands ignited into a fireball that burned off this mustache, half his beard and his eyebrows. I laughed my ass off for like 20 minutes. Didn't even phase him though, he just shaved off the rest of the beard the next day and went back to work, still cleanin parts with kerosene.