What is Murphy's Law?

Lol, the story of my life...

It also can be added with the phrase "At the most inopportune time" so "Any thing that can go wrong, will go wrong, at the most inopportune time". The phrase with which I have lived with all my life as a maintenance technician.

Danielle, Mine too lol

Shelby Johnson, that "negative energy" might give you high blood pressure or maybe an ulcer, but controlling the weather? Don't flatter yourself.

toe jam, Newton's First Law of Motion.

toe jam, inertia

toe jam, Newton's law.

what is, something in motion, stays in motion.

Wait for the best and prepare for the worst

An airforce mechanic during WW2coined the term, if anything can go wrong, it will, at the worst possible moment

Penned many ages prior-in the days, long preceding - "planned obselesence".