Not now, Scooby. Not now.
3 seconds sound clip from Scooby-Doo, Where Are You! - What a Night for a Knight (S1E1).
You can hear this line at 00:12:01.383 in the Blu-ray version of the episode.
Quote context
[...]
- Uh-oh.
- I've got it. That's better. Come on.
- Now look what that dog did. He knows I can't see without my glasses.
- Arrgh! Oh, there you are, Shaggy.
- 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.
[...]