What makes you say that? Just out of curiosity.
4 seconds sound clip from the Home Alone (1990) movie soundboard.
You can hear this line at 01:04:16 in the Blu-ray version of the movie.
Quote context
[...]
- He's getting in his car. I guess if you hurry, you can catch him.
- Damn! How low can you get? Givin' Kris Kringle a parking ticket on Christmas Eve.
- What's next? Rabies shots for the Easter Bunny?
- Santa, hold on! Can I talk to you for a minute?
- If you make it quick. Santa's got a little get-together he's late for.
- Okay. I know you're not the real Santa Claus.
- What makes you say that? Just out of curiosity.
- I'm old enough to know how it works.
- But I also know that you work for him. And I'd like you to give him a message.
- Shoot.
- I'm Kevin McCallister, 671 Lincoln Boulevard.
- Do you need the phone number?
- Okay. This is extremely important.
[...]