The rule your household has that sounds insane to outsiders and makes perfect sense to you

[HardyBoy13]

Every household develops its own private laws, arrived at through some forgotten incident or slow negotiation, that sound completely unhinged when said aloud to a guest and feel like basic common sense to everyone who lives there. Share yours and the story behind it if you know it

The best ones usually have an origin lost or embarrassing, a rule born from one specific disaster that then calcified into permanent law long after anyone remembers exactly what went wrong, the household equivalent of a scar that everyone still avoids touching

There is something lovely about how normal these become internally, you stop noticing your own household is strange until a friend stays over and asks with genuine confusion why the remote lives in the fridge or why nobody is allowed to say the word moist at dinner

So confess the rule, the reason if you have one, and the reaction you have gotten from an outsider encountering it for the first time, because the collision between insider normal and outsider bafflement is the whole point of this thread