Murphy's law

“If there is a wrong way to do something, then someone will do it.”

“If there's more than one way to do a job and one of those ways will end in disaster, then somebody will do it that way.”

“If there's more than one way to do a job, and one of those ways will result in disaster, then somebody will do it that way.”

“Anything That Can Possibly Go Wrong, Does”

“Colonel Stapp's favorite takeoff on sober scientific laws — Murphy's Law, Stapp calls it — 'Everything that can possibly go wrong will go wrong'”

“Murphy's Quantum Law: Anything that can, could have, or will go wrong, is going wrong, all at once.”

“With diligent effort he has established that there is no statistical basis for Murphy’s Law. He has also established that he believes in it anyway.”