- I think we better split up and try and find out where that moan came from. I'll go this way with Daphne and Velma. You go that way with Scooby-Doo.
- Thanks a lot.

8 seconds sound clip from Scooby-Doo, Where Are You! - Mine Your Own Business (S1E4).

You can hear this line at 00:12:25.145 in the Blu-ray version of the episode.

Quote context

[...]

- Hey, I found some candles.

- Shaggy, that's dynamite!

- D-D-D-DYNAMITE?

- That's strange. This end of the mine's lit by lanterns.

- Yeah, and I wonder who lit them.

(Ghost Moaning)

- Zoinks. You had to ask.

- That must be the moan Hank was talking about.

- I think we better split up and try and find out where that moan came from. I'll go this way with Daphne and Velma. You go that way with Scooby-Doo.

- Thanks a lot.

- And Shaggy, if you find anything, holler.

- I'm liable to holler even if I don't find anything.

- What are you trying to do, Scooby? Well, quit the clowning and come on.

(Scooby-Doo Whistling My Darling Clementine)

- Look at all these doors. You look in one of those, and I'll look in this one.

- Right.

[...]