- I'd like to get a close look at that ghost.
- How can we? He's gone.
- But his trail's not. Look. Glowing footprints. Now all we got to do is follow them.

11 seconds sound clip from Scooby-Doo, Where Are You! - A Clue for Scooby Doo (S1E2).

You can hear this line at 00:16:42.693 in the Blu-ray version of the episode.

Quote context

[...]

- Then, you saw him, too? He's the one that locked us in.

- So we haven't had a chance to find any clues.

- I found a clue! I found a clue!

- You? You found a clue?

- Uh-huh. Uh-huh. Follow me.

- It's a secret storehouse of scuba tanks.

- Yeah, and all ready to use.

- Things are beginning to add up.

- You mean like two and two are five?

- More than that.

- I'd like to get a close look at that ghost.

- How can we? He's gone.

- But his trail's not. Look. Glowing footprints. Now all we got to do is follow them.

- The footprints vanish right into the side of the cliff.

- Well, if my sense of direction is right, this is the same area where that yacht from the marina vanished.

- Now what do we do?

- Like, rest. I'm pooped.

- Hey! I'm sinking!

[...]