Well that explains it

by Feòrag

Pril has an interesting theory about Michael Jackson (not the beer one):

Several months prior to the release of Thriller, MJ was kidnapped by aliens. They replaced him with an extremely lifelike robot. Unfortunately, the robot was malfunctioning when it came off the assembly line (much like the Chrysler K-cars of the same period). Also, MJ has been letting Bat Boy live on the ranch, in a Kato Kaelin kind of way. The aliens, having realized their replacement wasn't functioning correctly, kindly left Bat Boy on the ranch to help keep an eye on him.

No hint as to how this information was acquired though.