Well, Boy Scouts was different....

The latrines at camp were outhouses, and the lids to the holes were constructed with a slightly forward lean -- this caused them to close whenever they were NOT being held up by someone sitting on the hole. The urinal was a metal trough.

1. Lift the lid, toss in a lit cherry bomb (a spherical firecracker about an inch in diameter). Drop the lid quickly. The resulting explosion will create a ring of...unpleasant material...on the bottom of the lid. Except, of course, that the bottom is what you leaned against when you sat....

2. Take a quart of homemade black powder, one with a bit too much charcoal in it. Pour it in the urinal. Run two wires from the gunpowder to a magneto outside the latrine. Wait about ten seconds after a gawky young boy scout enters the latrine. Crank the magneto. Watch the mushroom cloud effect from the flashing gunpowder pour out of the vents around the top of the latrine. Hear the boy scoout, covered with black dust and stumbling around with the pants about his knees, saying "The latrine blew up!" over and over.