Let me be honest about something here:
I really did like Michael Jackson when I was younger, and a lot of his earliest music. I was a kid when it came out and pretty much worshipped "Thriller", "Beat It" and other early songs he did. *BUT* in his later years he became a freak and there is no excuse for it. You can't even deny the baby dangling thing, and honestly the fact that he settled the child molestation allegations at the loss of a substantial amount of his personal fortune seemed to me as a confession of guilt as much as anything (buying his way out of jail time). Then of course there was the stuff they found in his house, like the bedroom security systems, and the hidden "pervo throne room" through a hidden wall panel where he took children to play and apparently plied them with booze (how much remains under speculation).
Truthfully Michael's death came about right as he was about to complete a downward spiral into oblivion and freakdom. The timing was just barely on the edge of where his image could be saved (intentional or not).
That said contacting the guy with a seance sounds like a recipe for disaster. IF you believe in such things Michael isn't exactly what I'd consider a benevolent fellow to leave behind a benevolent and communicative spirit (if an act, I'd wonder how the guys doing the seance would portray him).
For those that don't believe in things, it's simply tacky, and I have to wonder how much money they are making off of it.
I have very mixed opinions when it comes to paranormal activity to begin with, however my basic attitude is that if contacting spirits is possible it isn't that easy.
