Well, so long, you old blockhead. It's been nice knowing you.

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

You can hear this line at 00:09:34.053 in the DVD version of the movie.

Quote context

[...]

- What kind of a lunch is this?

- It must be a fancy continental lunch, sir. I see there's a gravy boat. It seems to be water, sir.

- They should have had bowls.

- Ew! Dog food.

- Well, I sure hate to say goodbye, Charlie Brown. It's sure been nice knowing you.

- This is really happening. I can't believe it.

- Well, so long, you old blockhead. It's been nice knowing you.

- I don't know what to say. I can't believe it. I, I...

- Snoopy always wanted this blanket. I think maybe I'll leave it with him.

- Linus is gone. If you're still waiting for your sweet baboo, you'd better forget all about it. I just saw him leave.

- What do you mean, leave?

- He's gone.

[...]