And the cast is on his left leg.
3 seconds sound clip from the Double Indemnity movie soundboard.
You can hear this line at 00:45:34 in the DVD version of the movie.
Quote context
[...]
- It's the 10:15 from Glendale. I'm driving him.
- It's still the same dark street, isn't it?
- And the signal is three honks on the horn.
- No.
- Oh, uh what color did you pick?
- And the cast is on his left leg.
- Mmm-hmm. Yeah, that suits me fine.
- This is it. I'm shaking like a leaf. But it's straight down the line for both of us.
- I love you, Walter. Goodbye.
[...]