It was a very clever plan.
2 seconds sound clip from Scooby-Doo, Spooky Space Kook (S1E15).
You can hear this line at 00:19:57.767 in the Blu-ray version of the episode.
Quote context
[...]
- He was wearing rubber boots to make those strange tracks.
- Dipped in phosphorus, no doubt.
- You can, like, shut it off, Fred.
- He's had enough of being a space ghost.
- Well, I don't believe it. It's Henry Bascomb, my next door neighbor.
- But what about those weird noises, and the flying thing?
- But what about those odd voices?
- It was just a speeded-up soundtrack... played over the loudspeaker.
- But we did see a whole bunch of those creepies over by the motor pool.
- Wanna bet they're all stuffed dummies?
- And you want to bet that crazy jeep was run by remote control?
[...]