Well, the local people are very superstitious. They believe an old legend about a real Ape Man. They say he's the one that burned down the old mansion years ago.
11 seconds sound clip from Scooby-Doo, Where Are You! - Never Ape an Ape Man (S1E7).
You can hear this line at 00:01:40.599 in the Blu-ray version of the episode.
Quote context
[...]
- The Ape Man of Forbidden Mountain.
- What a groovy title for a picture.
- It sure was swell of you to give us jobs as extras.
- Kids, I'm the grateful one. I need you because the local people won't work in this film.
- How do you look? I don't see any difference. Ha ha ha.
- We've had 3 reports that the Ape Man has been seen up here at night.
- They've seen a real Ape Man?
- I just remembered a dental appointment back in town. Me, too.
- Stop it, you two. It's only a superstition, right, Uncle John?
- Right.
[...]