
- What's the PROTOCOL for leaving?
- I don't know.
The Big Bang Theory Season 1, Episode 1

Do you honestly expect me to believe
social PROTOCOL dictates...
The Big Bang Theory Season 2, Episode 19

-Yes. I think the PROTOCOL can wait.
-No, tell me about it.
Money Heist Season 3, Episode 7

Well, I'm not sure of the PROTOCOL.
The Big Bang Theory Season 10, Episode 16

and establishes
a sort of handshake PROTOCOL.
Westworld Season 2, Episode 8