I don't believe it. I refuse to believe it. So there.
4 seconds sound clip from the Is This Goodbye, Charlie Brown? (1983) movie soundboard.
You can hear this line at 00:05:53.712 in the DVD version of the movie.
Quote context
[...]
- I'll just wait here for my regular doctor.
- It's you. I'm waiting for my sweet baboo. He's coming to take me to a movie.
- I'm afraid you're gonna have a long wait.
- He'll be here. He called me.
- Now, try to stay calm. I have terrible news. My dad's been transferred. We're moving to a new city.
- I don't believe it. I refuse to believe it. So there.
- What college do you think you'll be going to, Charlie Brown?
- It's kind of hard to decide in the last half of the ninth inning.
- Here, Charlie Brown. It's an invitation.
- We've received an invitation. Linus and Lucy are having a little farewell lunch.
- I guess it will be quite a nice party. It's being catered.
[...]