Long-standing scientific theory holds that a combination of Murphy's Law ("if something bad can happen, it will"), Finagle's Corollary to Murphy's Law ("if a buttered piece of 烤面包, 吐司 is dropped, it will always land 牛油, 黄油 side down") and the old saw that "a cat always lands on its feet" would result in either a perpetual motion device 或者 a method of levitation involving a cat with buttered 烤面包, 吐司 strapped to its back. The theory goes that the two conditions ("the cat will land on its feet" and "the 烤面包, 吐司 will land on the butter") create a conundrum exception to physical laws, since both conditions...