Surprised, aren't you? I knew you would be.
5 seconds sound clip from the The Nightmare Before Christmas (1993) movie soundboard.
You can hear this line at 00:46:35 in the Blu-ray version of the movie.
Quote context
[...]
- Sandy Claws. In person. What a pleasure to meet you!
- Why, you have hands. You don't have claws at all!
- Surprised, aren't you? I knew you would be.
- You don't need to have another worry about Christmas this year.
- What?
- Consider this a vacation, Sandy. A reward. It's your turn to take it easy.
- But there must be some mistake.
[...]