But I don't understand. I mean, I...

3 seconds sound clip from the Is This Goodbye, Charlie Brown? (1983) movie soundboard.

You can hear this line at 00:11:33.156 in the DVD version of the movie.

Quote context

[...]

- He and Lucy have moved away. Their whole family just plain moved away.

- That's ridiculous. He can't move away. We had a date. Things like this just don't happen. I had a firm date. We had an understanding. I'll sue!

- Where was that big truck going?

- That's a moving van. Linus and Lucy have moved away.

- But I thought she was just kidding. I didn't think they'd really go.

- Well, what do you care? You never liked Lucy anyway. You were always picking on her.

- But I don't understand. I mean, I...

- Oh, stop making excuses. Go on home and play your old Beethoven.

- Schroeder, what if you and I got married someday, and...?

- I never even said goodbye.

- Look, a postcard from Linus.

[...]