A theory which states that human lives are dictated by the movements of the tram system in central Helsinki. The name comes from "Spora" which means tram in Helsinki slang. It was developed by Nils Mustelin to demonstrate just how absurd astrology is.
Of course, supporters of Astrology have stated that if the tram system were to affect humans for thousands of years, some correlation in tram movements and human lives would become apparent.