Secret Handshakes and Inside Jokes

Inspired by a conversation on the Bobby Bones Show podcast [<a href="https://www.iheart.com/podcast/139-bobby-bones-show-25100459/" rel="noopener">https://www.iheart.com/podcast/139-bobby-bones-show-25100459/</a>], we ask: What secret handshake, password, or only-they-would-know identifiers does your family use just in case someone gets replaced by a cyborg and you need to expose the impostor?