Better be careful how you drive or the first thing you know you'll be ice cold.
5 seconds sound clip from the Reefer Madness (1936) movie soundboard.
You can hear this line at 00:25:20 in the Blu-ray version of the movie.
Quote context
[...]
- I only wish you had a couple of kids so I could...
- Get out!
- All right, Jack, pick up your stuff from Danny. It'll be ready by then.
- Let's go, Jack, I'm red-hot.
- Better be careful how you drive or the first thing you know you'll be ice cold.
- Take it easy, kid. Slow down, you'll kill somebody.
- Mary, you're not eating your breakfast again.
- Bill Harper hasn't been around lately. Anything wrong between you two?
- Why should there be anything wrong?
[...]