Donald Scruggs is a mechanical engineer and inventor. His most bizarre invention has come to be known as "the screw-in coffin." It's a casket shaped like a gigantic screw, with the idea being that it goes into the ground easier -- and uses cemetery space more efficiently by burying people (or pets) vertically. "It definitely is not for everybody," says Scruggs. Agreed. Here's a short video by PBS explaining the invention, and tastefully avoiding anything gruesome.
Scruggs: "It's no more trouble than putting a fence post in."