Also known as The Law of Sod, this term refers to the global phenomenon of how something will go wrong just exactly when one most wants it to go right.
One example of Sod's Law: After weeks of flat seas, the surf turns perfect the day you drop (and break) your surfboard while moving it out of storage.
British/Australian version of Murphys Law. Has been made infamouser by a recent British Gas Advert. Basically, if anything can go wrong, it will, and bad luck reigns the day AFTER the charm is lifted.