In Robert Harris' Enigma one of the characters invokes "Sod's Law," which from context means that what everyone has been waiting for will happen immediately after those waiting to respond have given up waiting and have been sent away. It's the transPondian version of Murphy's Law, I gather ("If anything can go wrong, it will.").

PS. He was right, of course; that's exactly how it unfolded, and Sod's Law operated precisely on schedule.