Presented at PAX Unplugged 2025. We've all been there. You're an hour into a three-hour game and someone says the dreaded words. "Can you hand me the rule book?" You messed something up. You moved the provost too far or not far enough or you don't even know what the provost is. Or maybe someone bumps the table and you don't know where all the cubes were. Or you messed up the endgame scoring. We've all had a tabletop game CRASH, but what does that mean mechanically? Are some games more or less prone to rules failures? How should game designers take errors into account?