- Yeah. All that's left are her footprints on that rug.
- Wait a minute. There's something funny about those footprints. Look at the way they slide back to the edge of the rug.
- That can only mean one thing.
- Like, she had big feet?

13 seconds sound clip from Scooby-Doo, Where Are You! - Which Witch Is Which (S1E13).

You can hear this line at 00:09:38.289 in the Blu-ray version of the episode.

Quote context

[...]

(WITCH CACKLING)

- So you dared enter the swamp, in spite of my warning signs.

- You shouldn't believe everything you read.

- No, my pretty?

- I think you meddlers must be taught a lesson in witchcraft.

- Smoke of evil, make her vanish!

- Daphne!

- Poor Daphne. Gone forever in a puff of smoke.

- Yeah. All that's left are her footprints on that rug.

- Wait a minute. There's something funny about those footprints. Look at the way they slide back to the edge of the rug.

- That can only mean one thing.

- Like, she had big feet?

- No, silly. She slid down through a trap door in the floor.

- So that's how it works!

- Yeah, but then what happened to Daphne?

- I don't know.

- Shaggy, footprints.

- Footprints? Look what Scooby found!

- I wonder where they go.

- Let's follow them. Maybe they can lead us to the answer. Come on!

[...]