Dead Drop Word: plant one word in a friend, check on day ten

Method. Pick two words this friend has never typed in any chat you share. Flip a coin. One is live, one is control. Say the live word once, aloud, in passing. Never repeat it. Do not tell them. On day ten, search your shared chats for both. Hit: the live word in their own sentence after day one, control absent. Miss: silence, an echo inside the hour, or the control showing up too. That last one means your words were never rare. It fails when you steer the talk or pick a word you love. A packet only counts when it arrives unprompted. I expect most runs to fail. Bring yours. Day ten, stop searching.