These are just kids. Grownups never believe in Santa.
5 seconds sound clip from the 'Twas the Night Before Christmas (1974) movie soundboard.
You can hear this line at 00:10:00.376 in the Blu-ray version of the movie.
Quote context
[...]
- Here's our first example of how you ruined everyone's Christmas with your opinions.
- This children's hospital once knew laughter, best medicine there is, but not anymore.
- There's Davey Thomas, best artist in school.
- He made that picture of Santa when he thought that Santa cared.
- These are just kids. Grownups never believe in Santa.
- Don't quite know everything, do you?
- Mr. Trundle's been hard at work making a special clock. There's the model.
- When the clock strikes 12 on Christmas Eve, it'll play a song welcoming Santa.
- Does that sound like a man who doesn't believe?
[...]