If anything can go wrong, it will go wrong.
I have traced 'Murphy's law back to a Captain Edward A. Murphy, an American engineer at Muroc, California (later named Edwards Air Force Base). In 1949 he was working on a project to test the effects of sudden braking. Time after time his machinery failed, exasperated he said of his technician, "If there is any way to do it wrong, he'll find it." John Paul Stapp picked up on Murphy's phrase and used at a press conference.
As with any good idea, Murphy's Law can be adapted and extended.
If there is a possibility of several things going wrong, the one that will cause the most damage will be the one to go wrong.
If you realize that there are three possible ways in which something can go wrong, and cover them all, then a fourth, unprepared for way, will miraculously appear out of thin air.
When something breaks, the parts damaged are in direct proportion to their value.
The failure does not appear until the machinery has passed its final inspection.
When you drop a part, it always rolls into the darkest corner.
Any attempt to print out this copy of Murphy's law will crash the computer.
LOL, now have a good Friday. Hope you aren't still stuffed from yesterday.