Who the heck are you?
3 seconds sound clip from the Elf (2003) movie soundboard.
You can hear this line at 00:36:43 in the Blu-ray version of the movie.
Quote context
[...]
(SANTA HOLLERING, KIDS CHEERING)
- Santa!
- What are you talking about? I'm Santa Claus. No, you're not. Why, of course I am. Ho-ho-ho.
- Well, if you're Santa, what song did I sing for you on your birthday this year?
- Happy Birthday, of course. Ho-ho-ho.
- Four.
- You're a big boy. What's your name?
- Paul.
[...]