I just remembered. I'm free.
4 seconds sound clip from the Desk Set (1957) movie soundboard.
You can hear this line at 00:26:48 in the Blu-ray version of the movie.
Quote context
[...]
- Uh, Miss Watson, are you free for lunch?
- Yes. Why? Is there some company policy that prohibits two people...
- No. No, no, no. Uh, I'll check my appointment book.
- I just remembered. I'm free.
- Good.
[...]