I disagree, redneck.
Mankind knows less than it would like to believe... We're still discovering new things about our own bodies. And, although, I can't prove that ghosts, God, or the "supernatural" in general exists... I cannot prove that they don't.
A typical Evolutionist argument would be, "Science can prove what can't exist by looking at what does exist" (More or less (The Circle-Square argument)) *Something along those lines.
However, new discoveries in the fields of science merely uncover and explain what has always existed to be true... And, well, we're still making new discoveries.
I dunno... I probably got a little ahead of myself here... Anyway ~ that's why I disagree.
Now, @ CC (sorry if you don't like me calling you CC),
I've been told that Ouija Boards create portals to the spiritworld.. And that sometimes you can let Evil spirits out.
That's only the popular belief that I've been told. I cannot say for myself, since I haven't used one. *I don't plan on using one - better safe than sorry, right?*
But, if you do believe, it's something to be careful with.