Put your tongue up in front of the teeth.
4 seconds sound clip from the Miracle on 34th Street (1947) movie soundboard.
You can hear this line at 00:40:37 in the Blu-ray version of the movie.
Quote context
[...]
- On the contrary, Haislip, Haislip, Sherman, Mackenzie and Haislip have been very kind to me.
- But being an exceptional lawyer, I want to open my own office.
- Would you put this in Susan's place for me, please?
- I think you can take the meat out. It should be done.
- No, no. Don't forget to scratch now.
- Put your tongue up in front of the teeth.
- That's right. Talk to the other monkeys.
- Oh. We're just having our first lesson in pretending. Doing quite well at it too.
- That's right. Go on now. Call the other monkeys. That's right.
- Now you're a goose. No, you mustn't be a goose. Be a monkey. See?
[...]