"The Infinite Improbability Drive is a wonderful new method of crossing interstellar distances in a few seconds, without all that tedious mucking about in hyperspace. As the Improbability Drive reaches infinite improbability, it passes through every conceivable point in every conceivable universe almost simultaneously. So you're never sure where you'll end up or even what species you'll be when you get there. It's therefore important to dress accordingly. The Drive was invented following research into finite improbability often used to break the ice at parties by making all the molecules in the hostess's undergarments leap one foot to the left in accordance with the theory of indeterminacy. Many physicists said they wouldn't stand for that sort of thing, partly because it debased science, but mostly because they didn't get invited to those sort of parties." Hitchhiker's Guide