Zoinks! There's that sound again.
2 seconds sound clip from Scooby-Doo, Spooky Space Kook (S1E15).
You can hear this line at 00:06:27.329 in the Blu-ray version of the episode.
Quote context
[...]
- It's Scooby. How did he get in there? Hey, Scooby, I'm glad you're out.
- Nothing.
- I mean the window is too dirty to see through.
- Come on.
- Look at that. The tracks vanish right at the door.
- I see something. A generator. And it's still warm.
- I'll bet you that's what that humming sound was.
- But who would be running a generator on an abandoned airfield?
- Zoinks! There's that sound again.
- It's the weirdo spaceship! And it looks like it's coming down close to here.
- Come on. Let's split up and see if we can find this mysterious ghost from space.
[...]