Most of it is psychological.
You can get them from Toys-R-Us, would have been fun when I was about 12.
I'm now male and 25 years old.
But... when I was about 10, I was a little girl living in Washington in the US.
I played with a Ouija board. Bad mistake.
A demon took up lodging in my body, causing me to do all sorts of crazy ****. For example I spider-walked backwards down the stairs, peed myself in front of my mum's mates, projectile vomited over a priest and then my head turned 360 degrees. I ended up killing a guy, as well as two priests.
My advice, don't play with Ouija boards.