Zoinks! They're opening.
2 seconds sound clip from Scooby-Doo, Where Are You! - A Night of Fright Is No Delight (S1E16).
You can hear this line at 00:14:00.073 in the Blu-ray version of the episode.
Quote context
[...]
- Let's get out of here. I don't like playing musical riddles.
- That's it! Daphne, this is a musical riddle.
- I've got it. Feed isn't a word. It's musical notes. F, E, E, D.
- Look! Secret stairs in the floor.
- Come on. Let's see where they go.
- Creepy, cobweb-filled catacombs.
- And the empty one's, like, dog-shaped.
- Only he's not a shadow. He's a green ghost.
- Like, let's get out of here.
[...]