- Rocko, everybody knows penguins can't fly.
- You're wrong! You are dead wrong. Our ancestors flew.

9 seconds sound clip from the The Pebble and the Penguin movie soundboard.

You can hear this line at 00:31:09.460 in the Blu-ray version of the movie.

Quote context

[...]

- You know what you need? You need a dream.

- I got one.

- What is it?

- I'm sure not gonna tell you.

- Your secret's safe with me.

- I don't even know you.

- I won't laugh.

- Forget it!

- It doesn't matter how silly it sounds.

- Get away!

- I promise. Cross my heart. I won't laugh.

- All right. All right. All right.

- What?

- I got something.

- What is it?

- You're looking at it.

- I'm looking at...

- You want to fly, do you?

- Don't laugh.

- Rocko, everybody knows penguins can't fly.

- You're wrong! You are dead wrong. Our ancestors flew.

- They gave us wings, but we can't fly? I mean... I mean, whose idea of a cruel joke is this?

- I mean... I mean, you've got to just accept it.

- No. No. I don't accept nothing.

- But, Rocko, that's the way things are.

- I want to fly. I'm gonna fly, and no one's gonna stop me. I'm flying. Flap them. Flap them. Flap them.

[...]