I think I fit the description.
3 seconds sound clip from the It's Magic, Charlie Brown movie soundboard.
You can hear this line at 00:05:20.245 in the VHS version of the movie.
Quote context
[...]
- Now I will ask the volunteer to step into the box.
- Quiet, everybody, while the Great Houndini performs that fantastic trick.
- Ow!
- Attention, attention. We will need another fearless volunteer.
- I think I fit the description.
- I'll go up there and help my good friend Snoopy.
- If you will just step into the magic closet, we will amaze the audience.
[...]