It's hard on a little kid who's always dependent on a blanket, especially when he's suddenly deprived of it. He's feverish.
11 seconds sound clip from the It's an Adventure, Charlie Brown movie soundboard.
You can hear this line at 00:40:44.541 in the Blu-ray version of the movie.
Quote context
[...]
- Linus tells me you've buried his blanket. Are you sure that was the right thing to do?
- Of course I'm sure. I'm always sure of everything I do.
- This is gonna be a long night.
- 10 o'clock? Good grief. This night is going to last forever. I'll never make it.
- Why did Lucy have to bury my blanket? Why?
- Anyway, Charlie Brown, it's really nice of you to sit up with me this first night.
[...]