Scooby-Doo! Scooby-Dooby-Doo!
9 seconds sound clip from Scooby-Doo, Where Are You! - What a Night for a Knight (S1E1).
You can hear this line at 00:13:25.534 in the Blu-ray version of the episode.
Quote context
[...]
- Arrgh!
- I told you to take care of that cold.
- Aargh!
- Lucky I brought your medicine.
- I can't find that Velma nowheres. Zoinks!
- This will fix you up in a jiffy.
- See? You sound better already!
- Scooby-Doo! Scooby-Dooby-Doo!
- I tell you, the Black Knight is alive and roaming through the hallways.
- If we could only find a clue.
- When Velma said clue, she didn't mean you, Scooby.
[...]