You're going to be a big hit at camp, carrying your head in a sack.
4 seconds sound clip from the It's an Adventure, Charlie Brown movie soundboard.
You can hear this line at 00:04:13.910 in the Blu-ray version of the movie.
Quote context
[...]
- And then I got this rash or something on my head.
- And well, am I cracking up, doctor? Is this the last of the ninth?
- What are you packing for, big brother?
- My doctor says I should go to camp. He said I'll have to do something to take my mind off baseball.
- I've seen you play. I never thought you had your mind on it.
- Thanks a lot. I'll see you in two weeks.
- You're going to be a big hit at camp, carrying your head in a sack.
- So here I am on a bus going to camp.
- For someone who hates going to camp, I sure spend a lot of time there.
- Hey, don't just stand there, kid. There's a meeting over at the main building.
[...]