In the extreme, I've seen a few times placing 4lbs of C4 in the bottom of a 55 gallon drum (tilted at a 45 degree angle and dug in) half-full of mogas. Right much effective - HUGE fireball.
There's a place for it - in defense of a perimeter at a base-camp in a war zone. NOT AT HOME, NOT AT THE RANGE, NOT PLAYING AROUND.
The possibility of some vapors igniting from static electricity in such close proximity to black powder is asking for a one-line spot on the national news or nomination for the Darwin Award.