What? You mean it?
4 seconds sound clip from the A Charlie Brown Thanksgiving movie soundboard.
You can hear this line at 00:21:34 in the Blu-ray version of the movie.
Quote context
[...]
- We're gonna be a little late. You see, I invited a few friends over and they're still here.
- Well, it's just Linus and a girl named Marcie and a girl named Peppermint Patty
- She's a great baseball player.
- No, ma'am, they haven't eaten. As a matter of fact, they've let me know that in no uncertain terms.
- Hey, Peppermint Patty, great news.
- We're all invited to Charlie Brown's grandmother's for Thanksgiving dinner.
[...]