So it was apparent that Dr. Najib knew the secret of the coin, and after you kids left, he broke in, hoping to steal it, but when I surprised him, he had to tie me up in the shack.
11 seconds sound clip from Scooby-Doo, Where Are You! - Scooby Doo and a Mummy, Too (S1E12).
You can hear this line at 00:19:44.017 in the Blu-ray version of the episode.
Quote context
[...]
- Well, Scooby Dooby Doo. Whoops!
- Now let's see who's really behind these bandages.
- And when he couldn't find the coin, he knew one of us must have it.
- So he devised this whole mummy plan to scare us into giving it to him.
- But we wouldn't give it to him, and later we figured out the secret.
- Wow! A secret compartment with a glass beetle in it!
- Not quite a glass beetle. It's Anka's most valued treasure... a diamond scarab worth a fortune.
- So that's what he was after!
[...]