That's right. How did you know that?
3 seconds sound clip from the Back to the Future Part II movie soundboard.
You can hear this line at 01:14:06.993 in the Blu-ray version of the movie.
Quote context
[...]
- Excuse me, sir. Yes, you with the hat.
- Who, me?
- Yes.
- Be a pal and hand me a five-eighths inch wrench out of that toolbox.
- Five-eighths? Don't you mean three-quarters?
- I presume you're conducting some sort of weather experiment.
- That's right. How did you know that?
- Oh, I happen to have had a little experience in this area.
- Well, thanks. Nice talking to you. Maybe we'll bump into each other some time again in the future.
[...]