Shh. I hear it too.
5 seconds sound clip from the Christmas Vacation (1989) movie soundboard.
You can hear this line at 01:19:33 in the Blu-ray version of the movie.
Quote context
[...]
- Do you hear it? It's a funny squeaky sound.
- You couldn't hear a dump truck driving through a nitroglycerin plant.
- We can't let it get out of the living room.
- Where's Eddie? He usually eats these goddamn things.
- Oh, not recently, Clark. He read that squirrels were high in cholesterol.
[...]