Him [*singing*]: Once, I was a billion years old.
Me: I… I don’t think that’s true.
Him: Why not?
Me: That’s not how time works.
Him: What do you mean? Now, I’m a billion and one.
Me: Oh. Well, in that case.
Him: Do you think that’s how this dynamic works? That you can just question if I’m a time lord whenever you want?!
Him, a few minutes later [*singing*]: Once, I was a trillion years old.