The Mystery of Oujia Boards

I was wondering…

What do you know about Oujia boards and don’t say they are bull****. Thanks.

My friend recommends I never use one because he said he saw “things” which I will not say here…

I tried it once like 4 years ago but the pointer didnt move.

Have you ever tried one? Does it REALLY move by itself? How does it do that?