How did you know that? Have we met before?

3 seconds sound clip from the Clue (1985) movie soundboard.

You can hear this line at 00:14:59.365 in the Blu-ray version of the movie.

Quote context

[...]

- So what do you do, Professor?

- I work for UNO, the United Nations Organization.

- Another politician. Jesus!

- No, I work for a branch of UNO. WHO, the World Health Organization.

- Well, what's your area of special concern?

- Family planning.

- What about you, Colonel, are you a real colonel?

- I am, sir.

- You're not gonna mention the coincidence that you also live in Washington, D.C.?

- How did you know that? Have we met before?

- I've certainly seen you before, although you may not have seen me.

- So, Miss Scarlet, does this mean that you live in Washington, too?

- Sure do.

- Does anyone here not live in Washington D.C.?

- I don't.

- Yes, but you work for the United Nations. That's a government job. And the rest of us all live in a government town.

[...]