Have you ever had an "inside joke" with yourself?

I have these 2 female coworkers, who are always together. Walking thru halls together, at duty together etc. They even sit in person A's tiny office together with the door closed.

So in my mind, they are secret lovers and must be in the office doing it.🤭

And now person B is pregnant and i was amused because my suspicions must have been true 😄