I didn't think you'd learned it from a correspondence course.
5 seconds sound clip from the Double Indemnity movie soundboard.
You can hear this line at 00:18:08 in the DVD version of the movie.
Quote context
[...]
- Never mind the beer. Iced tea will be fine.
- Fresh.
- I used to peddle vacuum cleaners. Not much money, but you learn a lot about life.
- I didn't think you'd learned it from a correspondence course.
- Where'd you pick up this tea drinking? You're not English, are you?
- No. Californian. Born right here in Los Angeles.
- They say all native Californians come from Iowa.
- Mr. Neff, I -Make it Walter, huh?
- Walter.
- Tell me, on this insurance, how much commission do you make?
[...]