Haha,remember using one on a cold morning and noting after a few min that there was no heat. Looked to my right and noticed it was pouring fuel all over the ramp out the exhaust. I think I got lucky on that one, if it ignited it would have been messy. Otherwise, they usually work damn well and it's nearly instant heat. I think we used similar ones in the army running off of jp5 or something, THOSE never worked, but the aviation ones I've used have worked well.