Actually, I was watching some Chopper Build off show a few weeks ago - the one where they drop off the crate and laptop with the instructions and sponsor info.
Well, this guy had it set up where there was a separate fuel line to the exhaust, with a spark plug mounted just aft. Let me say it would definitely do the trick. Now, I'm not sure how comfortable I'd be running that set up myself, but it sure provoked some pleasantly evil visions!
Speaking of evil
Can always use a 110 and lay down an oil slick...
That's bad - funny - but really bad!