- What's that noise?
- I don't know.
- It came from this room.
6 seconds sound clip from Scooby-Doo, Where Are You! - Never Ape an Ape Man (S1E7).
You can hear this line at 00:14:17.799 in the Blu-ray version of the episode.
Quote context
[...]
- Scooby, will you do it for a few Scooby Snacks?
- Hmm...
- You'll get a bonus snack after you get the Ape Man down here, OK?
- OK.
- Scooby Snacks won't work on me this time.
- Would you do it for a Shaggy Snack, a little something I whipped up?
- Wow! Look at those trophies... a deer, a rhino, a lion, and a...
- Ape Man?
- Ape Man? Don't be silly. That's only a trophy.
- Come on. Let's play a game, Scooby.
[...]