Here's the set up: a fertilizer tank spraying a field got clogged so the farmer got out to see what's going on.... He started to fiddle with the spray hose.... and BAM!
You can so tell what's going to happen, but when it happens, you'll probably laugh anyway! Here's a perfect example of puerile (and gross - you've been warned) humor: Hit play or go to Link [Live Leak] - Thanks algonkin!
period.
"Hey, honey. Wanna come film me spraying manure on the field?"
Here's how they did it: Farmer turns off sprayer, leaves tractor. Camera focuses on back of sprayer, accomplice enters tractor, waits, waits, waits, turns on sprayer.