What's the matter? Did you lose something? Is this yours?
8 seconds sound clip from the It's Magic, Charlie Brown movie soundboard.
You can hear this line at 00:18:47.843 in the VHS version of the movie.
Quote context
[...]
- What's that supposed to mean? That's the dumbest thing I ever heard.
- This is ridiculous. I can't walk downstairs because I can't see my feet.
- Snoopy will just have to make me visible again.
- What's the matter? Did you lose something? Is this yours?
- All right, beagle. Here's your magic book.
- You made Charlie Brown disappear. You better make him reappear.
- Now, you start figuring out how to make him visible again, or I'll pound you.
[...]