Buttered bread-cat array.
Sadly, the original is lost to time, way back in the dial-up internet era. It was originally on the Darwin awards forum. It went on for pages and pages, all written in properly and formally. It was glorious.
The basic premise was 2 fold. 1. Buttered bread always lands butter side down. 2. Cats always land on their feet. Assume both of these as absolute facts. What would happen if you strapped a piece of buttered bread, butter side up, to the back of a car?
Incidentally, if anyone knows of a copy of the original, I would love to read through it again.