Murphy's Law states "If anything can go wrong it will go wrong." The question is "Can that be proven conclusively?"
My dad and I were theorizing about it a while back and came to this paradoxical conclusion- Murphy's law cannot be proven wrong in any circumstance. Murphy's law is always proven wrong in every circumstance.
See if you can work out how it works!
Edit: Here's how it works.
If something goes wrong, then nothing has gone wrong with the law. Thus something that can go wrong hasn't.

If something hasn't gone wrong, then the something has gone wrong with the law