In layman’s terms, this law states that some things simply have to happen. If there’s a red button on a console with the words don’t push taped above it, someone will push it. If there’s a gun hanging conspicuously above Chekhov’s fireplace, someone is going to end up shooting it (probably at Nietzsche). And if there’s a stern woman telling you what to do—yet at the same time calling you “my lord”—you’re going to simply have to figure out how far you can push her.
