Unless you know what you are doing with a Ouija board--DO NOT MESS with it. You could open up something that you can't control. I have heard this from many spiritualists, hunters, etc. It can be very dangerous.
My granddad once told me that my mom, aunts, and uncles once messed with one of these. He says he caught them with it and threw it into the fire and the board was screaming all night. How much of that's true, I can't be sure. But I thought I'd tell ya anyway.
As well as anther story. I was at home late one night (near La Plata), sitting on my computer. I was dead tired. I knew everyone in the house was asleep, it was like 3am, and I hear this voice right next to me, freaked me out for at least a week. This voice was deep country accent, and all it said was "I killed your daddy." Which was just enough to freak me out. I searched the entire house, everybody was still asleep, and I was wide awake until dawn.
I made the mistake of telling my grandma about it, she tells me it was an evil spirit. I think I was just really freaking tired.