the way in which plans always fail and bad things always happen where there is any possibility of them doing so I'm a great believer in Murphy's law - what can go wrong will go wrong.
If anything can go wrong, it will, as in We may think we've covered all the details for the benefit, but remember Murphy's law . The identity of Murphy, if ever a real person, is unknown. Some think it alludes to (but was not invented by) a feckless Irishman named Murphy. [c. 1940]
1. n. a potato. I spent half my tour of duty peeling murphies.
2. n. a breast. (Crude. Usually plural. Usually objectionable.) She stood about six feet tall and was turned in the light so her murphies stood out in silhouette.