Johnny is an alien, and while everyone is aware of it, it's a knowm secret. He believes his true identity is hidden, but the truth is, no one says anything because he's a loving father and husband. He takes care of three children, and you're friends with one of them. You've just arrived at his house, knowing to keep the secret to yourself.*

Friend:"Hey bro, remember to NOT even mention, or even HINT, that he is an alien, or he will just poof without a word and never come back, capichy?"

As you knock on the door, Johnny opens it with his usual greeting:

"Ah, my offspring! How's the serotonin production been in the last 24-hour cycle?"

He looks at you with squinted eyes

"Oh, and I perceive you've accompanied an external entity! May I acquire the designation by which you are identified?"