Heck, I don't believe in Santa Claus anymore. That's kid's stuff. Isn't it?
6 seconds sound clip from the The Year Without a Santa Claus movie soundboard.
You can hear this line at 00:19:28.010 in the Blu-ray version of the movie.
Quote context
[...]
- Oh, you poor man. Drink this, it'll make you feel much better.
- You say my friends were asking you about Christmas?
- Yeah. They wanted to know if we kids cared about Santa Claus and all.
- Heck, I don't believe in Santa Claus anymore. That's kid's stuff. Isn't it?
- You don't believe in Santa Claus, do you, Dad?
- Why, yes. Matter of fact, I do.
- I believe in Santa Claus like I believe in love.
[...]