- Shaggy, that ape is stuffed.
- Stuffed ape? Well, I hope you don't think it had me fooled for a minute. I knew it all the time.
- Oh, brother!

13 seconds sound clip from Scooby-Doo, Where Are You! - Never Ape an Ape Man (S1E7).

You can hear this line at 00:09:15.747 in the Blu-ray version of the episode.

Quote context

[...]

- Stick 'em up! What's the password? (2)

- Heh hee hee! Scooby Doo!

- That's what I call fowl play. Get it? Ha ha ha!

- It's the Ape Man! Look out! Help! He's got me. Ohh! Ohh! Help!

- Can't we talk this over man to Ape Man?

- Shaggy, that ape is stuffed.

- Stuffed ape? Well, I hope you don't think it had me fooled for a minute. I knew it all the time.

- Oh, brother!

- There isn't anything in here but old books.

- Here's something. It's a copy of the film's shooting script.

- Next you'll tell me the Ape Man was in here reading it.

- Someone left it open to the scene they were shooting today.

- Maybe there's a clue up here on these shelves.

- Hey, did you know that in the film people mysteriously vanished from this room?

[...]