Scooby, I thought you were taking a bath.
2 seconds sound clip from Scooby-Doo, Where Are You! - A Night of Fright Is No Delight (S1E16).
You can hear this line at 00:05:48.857 in the Blu-ray version of the episode.
Quote context
[...]
- Ahh, let's see. A little salt and a little pepper. And, oh, yes, a little fish food.
- Hey, Scoob, hurry it up, will you?
- Scooby, I thought you were taking a bath.
- Like, you mean the tub tipped up and slid into the basement?
- And you saw a shadowy, chain-rattling phantom?
- Come on. Let's take a look at that tub.
- Well, Scooby, the bathtub looks OK.
[...]