If this is some kind of practical joke, it's not funny and I know funny. I'm a clownfish.

Marlin (Albert Brooks)

7 seconds sound clip from the Finding Nemo movie soundboard.

You can hear this line at 00:18:18 in the Blu-ray version of the movie.

Quote context

[...]

- Stop following me, okay?

- What are you talking about? You're showing me which way the boat went.

- A boat? Hey, I've seen a boat. It passed by not too long ago. It went, um, this way. It went this way! Follow me!

- Wait a minute. Wait a minute. What is going on? You already told me which way the boat was going.

- I did? Oh, no.

- If this is some kind of practical joke, it's not funny and I know funny. I'm a clownfish.

- No, it's not. I know it's not. I'm so sorry.

- See, I suffer from short-term memory loss.

- Short-term memory loss? I don't believe this.

- No. It's true. I forget things almost instantly. It runs in my family. Well, at least I think it does. Uh... Hmm? Where are they?

[...]