both of them were in my teens... one of them in an abandoned house that my grandparents owned, I was with four other friends and we went there exclusively to play with the board, no drugs or alcohol were consumed previously.
After what seemed to be several hours of just having fun and playing around, this thing warmed up and we started hearing noises on the roof, as in chains being dragged around and other miscellaneous noises that could only fit in a movie. There is no further explanation and I seriously don't really want to know much about it.
Second one was even worse, as we decided to take the board to open ground, to my friend's countryside farm. This time THE BOARD ITSELF didn't let me play and it burnt my fingertips as I touched the planchette. However nothing strange happened after my friends played with it.
I know this stuff sounds unbelievable, but at least it felt real to me. I believe in things like good and bad energy, but up to this point, this is some of the most strage things I have ever experienced in my life.