Murphy's Law

That inevitable Irish law which always applies at times of great need. The indefatigable fourth law of thermodynamics" as described by Anne Roe, which clearly states: "If anything can go wrong, it will".
Now not one to break laws, of course, I found myself drawn into the unique ponderies of an unassailable topic. In any case, despite check and re-checks, just on the day of need, a key system goes down, which is subsequently followed by an example of bureaucracy gone mad. 
Ok so none of us can avoid the bureaucracy, but does anybody have an antithesis to Murphy's law? An anti-disaster Talisman? An "if anything will go in your favour... it will!" I'm happy to consider all proposals, from kissing the blarney stone to a Faustian bargain.