Wiktionary
n. An adage which proposes that every act has unintended consequences.
Usage examples of "law of unintended consequences".
She could still hear Siuan going on about what she called the Law of Unintended Consequences, stronger than any written law.
But the Law of Unintended Consequences could hit anyone, couldn't it?
Instead, in one of history's many illustrations of the Law of Unintended Consequences, the 21st century saw military technology enter an era of stalemate.
President, you are unleashing the power of the gods, and with it the law of unintended consequences.
Once more the Law of Unintended Consequences had risen up to bite him in the ass.
Mike Stearns was rather enjoying the reports coming out of the diplomatic pouches, which so clearly demonstrated that the rest of the world did not understand that Veronica Dreeson was a walking embodiment of the Law of Unintended Consequences.
It's called the Law of Unintended Consequences, something with which the Congress is familiar, isn't it?