Nope. You're wrong about the microwave. Nice try, however.
You won't be able to guess. it's got SOMETHING to do with electromagnetism.
It's actual
SCIENCE!
The ghosts are just random things. They feed off of human emotions so they hang around the center of drama and angst (high school). Also, each ghost has a particular 'feel' of emotion they enjoy eating the most... so they tend to follow those kind of people around. The ferret enjoys Paulina's emotions... but I don't know if she ever wanted or had a ferret for a pet. But she'll hate ferrets by the end of this. *evil grin* The fox, for example, likes 'sam' flavoured emotions. Get it? Kind alike Danny. Danny likes 'Sam' flavoured emotions too.
Valerie was brilliant. All props to the person who gave me the idea. XD
-Cori