Well, those footprints weren't made by a chicken. It looks like we've found ourselves a mystery.
5 seconds sound clip from Scooby-Doo, Spooky Space Kook (S1E15).
You can hear this line at 00:03:57.888 in the Blu-ray version of the episode.
Quote context
[...]
- They sure are strange-shaped tracks.
- Let's us make tracks the other way.
- Yeeow! He got me! He got me! He got me! Oh... Oh, help, he got me!
- Aw, you big chicken. It was only a chicken. Get down.
- Well, those footprints weren't made by a chicken. It looks like we've found ourselves a mystery.
- It sure was nice of that farmer to give us some gas.
- Yeah, now we can go look for that ghost craft.
- Well, you don't have to look any further. There it is.
- Zoinks! What a creepy-looking crate.
- We're in luck. It landed behind that hill.
[...]