What is Murphy's Law?
Correct answer: Anything that can go wrong, will

Danielle
Lol, the story of my life...

Powerjunk
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.

Castra
Danielle,
In the UK it's commonly called "sod's law"
There is a sympathetic colloquialism for someone who has an unfortunate accident " unlucky sod"

PhabPhour
Danielle, Mine too lol

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

Wannabe Vulcan
toe jam, Newton's First Law of Motion.

Modest Mouse
toe jam, inertia

sensei.
toe jam, Newton's law.

toe jam
what is, something in motion, stays in motion.

Player #57619674
Wait for the best and prepare for the worst

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

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