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Fog seeps through the door cracks, the floor is shaking and a spooky wail fills the room. But wait a minute! All these effects are created by a machine! To stop it, you have to count the correct number of keys:

Fact Lab

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Interesting fact:

The show's writers have admitted that they prefer writing for Velma, Shaggy and Scooby. That's why there are so many scenes where Fred and Daphne are sent off together to search for clues - which has led to fan speculation that the two are a couple.