- Hey, there's some writing on it. It says, Second passage of the old bell.
- Second passage?
- Old bell?
- There's no old bell in this old castle.
10 seconds sound clip from Scooby-Doo, Where Are You! - Hassle in the Castle (S1E3).
You can hear this line at 00:09:47.195 in the Blu-ray version of the episode.
Quote context
[...]
- Yeah!
- Like, he went through the wall, nonstop.
- There's a very logical explanation for all this.
- Why don't we take that phantom man's advice and clear out of this place?
- Hey, there's some writing on it. It says, Second passage of the old bell.
- There's no old bell in this old castle.
- Hmm.
- I've got it. The word passage must mean a passage in a book.
- Then The Old Bell must be the name of a book!
- And the best place to find a book is in the library.
- Well, this is the book called The Old Bell.
- Look, in the second passage, the word catacombs is underlined in red.
- And if my knowledge of history is correct, we should find catacombs in the basement.
[...]