I was in the hall. I know because I was there.
6 seconds sound clip from the Clue (1985) movie soundboard.
You can hear this line at 01:08:20.522 in the Blu-ray version of the movie.
Quote context
[...]
- No gun. Yvette dropped it here.
- Very well, I know who did it.
- You do?
- And furthermore, I'm gonna tell you how it was all done. Follow me.
- I was in the hall. I know because I was there.
- And then the doorbell rang. And it was you.
- Yes.
- I asked you for your coat, and I recognized you as Colonel Mustard.
- And I introduced myself to you as a butler, and I made across the hall to the library.
[...]