Reminds me of a story my dad used to tell... They had one of these "3-holers" out in the barn. The cleanout hatch was down below the hill on the backside of the barn.
It was around the 4th of July and he and his cousin were just a couple good-ole-boys having some fun. Gramps went out to use the facilities (middle hole of course). They went down below and planted an M-80 in the "ruins" and ran like Hell. Dad laughed like a sonofagun every time he told that story...He almost cried every time. Probably from the whoopin' he remembers getting HaHa.