Simply put, Rowley's law states that
8 out of 10 people are idiots or morons. There may be others who have tried to pen similar
laws, but Rowley of the M Lounge was the first
to describe this phenomena in detail and his older
posts describe this to a T. In the most basic terms, you can say the 8 out of 10 rule applies whenever you see someone behaving like a moron (which is often).