There's No Time for Love, Charlie Brown1973

[last lines, after Charlie Brown got his first 'A' on his report]

Patricia 'Peppermint Patty' Reichardt:
Chuck, I want to apologize for saying that you're stupid and wishy-washy and everything. It's not easy for a girl to talk like this to a boy, you know.

Charlie Brown:
I know. But I always used to think how nice it would be if that little red-haired girl would just come up to me and...

Patricia 'Peppermint Patty' Reichardt:
[blows him away with her yells] I can't stand you, Chuck!

Marcie:
[comes by] Well, sir, you said the wrong thing again, didn't you?

Patricia 'Peppermint Patty' Reichardt:
Kid, I want to ask you something: how come you're always calling me 'sir' when I keep asking you not to? Don't you realize how annoying that can be?

Marcie:
No, ma'am.

[Peppermint Patty winces from the word]