You got to be thinking of someone else.
4 seconds sound clip from the American Graffiti movie soundboard.
You can hear this line at 00:41:04 in the Blu-ray version of the movie.
Quote context
[...]
- I don't know, but I'm gonna find out.
- Well, come on, Bob. Come on, who is she? Come on!
- You know Mr. Beeman? He owns Hepcat Jewelers. That's his wife.
- Get out of here. That's ridiculous. That girl is young and beautiful.
- And she was cruising 10th Street.
- You got to be thinking of someone else.
- Hey, did you know that my ex is going to become a presidential aide?
- Yeah, and it's a secret, so don't tell anybody.
- His greatest ambition is to shake hands with President Kennedy.
- How do you suppose you're gonna do that, wishy-washy, at JC?
- Well, maybe I've grown up. Maybe I changed my mind.
[...]