For other uses, see Murphy.

Murphy's Law is a Terran aphorism which states that if anything can go wrong, it will go wrong.

James T. Kirk considered Murphy's Law an expression an innate human ability to ruin anything they put their hands to. (TOS novel: Strangers from the Sky)

Beverly Crusher struggled to explain this idea to Kendarayan envoy Sellassars, given her seeming expectation that she would need to provide him with medical aid during his visit aboard the USS Enterprise-E in 2372. (TNG - Slings and Arrows eBook: That Sleep of Death)