So that's how it works!
2 seconds sound clip from Scooby-Doo, Where Are You! - Which Witch Is Which (S1E13).
You can hear this line at 00:10:00.627 in the Blu-ray version of the episode.
Quote context
[...]
- 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.
- That can only mean one thing.
- No, silly. She slid down through a trap door in the floor.
- Yeah, but then what happened to Daphne?
- Footprints? Look what Scooby found!
- Let's follow them. Maybe they can lead us to the answer. Come on!
- Zowie!
- It's an old derelict riverboat.
- And those footprints lead right to it.
[...]