What is the most niche rule you know?

To clarify, I'm not looking for weird rules interactions or 'technically RAW interpretations', but plain written rules which state something you don't think most players know. Bonus points if you can say which book and where in that book the rule is from.

For me, it's that in order to use a sling as an improvised melee weapon, it must be loaded with a piece of ammunition, otherwise it does no damage. - Chapter 5 of the Player's Handbook, Weapons > Weapon Properties > Ammunition.

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