Dirty trick.
1 seconds sound clip from Scooby-Doo, Where Are You! - The Backstage Rag (S1E9).
You can hear this line at 00:14:36.102 in the Blu-ray version of the episode.
Quote context
[...]
- Hey, Daphne, Velma, come over here.
- I saw him! He was in that prompter's box!
- Run! Get out of here! There's a guy in a black cape running around!
- He was in that prompter's box. We ought to see what's in there, right, Scooby?
- Here's a Scooby Snack, no strings attached. Just catch.
- Well, come on. Let's get down below stage quick.
- What now? They're all empty. Not even violins in them.
- Maybe this whole thing's a wild goose chase.
[...]