There's a mollusk. See, and he walks up to... Well, he doesn't walk up, he swims up. But, actually, the mollusk isn't moving. He's in one place.
11 seconds sound clip from the Finding Nemo movie soundboard.
You can hear this line at 00:08:31 in the Blu-ray version of the movie.
Quote context
[...]
- Phil.
- Hey, you're a clownfish. You're funny, right? Hey, tell us a joke.
- Well, acutally that's a common misconception. Clownfish are no funnier than any other fish.
- Yeah! All right. I know one joke.
- Sheldon! Get out of Mr. Johanssen's yard now!
- All right, you kids! Where'd you go? Where'd you go? Where'd you go?
- Dad, dad. Can I go play, too? Can I?
[...]