The general understanding of Murphy’s Law is, “Anything that can go wrong will.” We say this anytime anything sucks, like some mantra of pessimism. When Interstellar‘s Murph Cooper asks her dad why she was named after something bad, he explains with the original wording of Murphy’s Law, a version of “Whatever can happen, will happen.” This is the key to the entire film, plot holes and all.

SPOILERS ahead!