Friggan Law refers to one of Murphy's famous laws; If 'A' and 'B' are both needed to accomplish 'C' AND either 'A' OR 'B' is in a state of brokenness, the working entity will most likely break when the previously broken prerequisite of 'C' is fixed.
Murphy's friggan Law... I finally get the washing machine fixed and the very next day the dryer goes up in sparks and smoke! :(