I have used a ouija board..
We were friends with some neighbours where we used to live, and one day they invited us round for drinks. In the course of the evening (after they'd had quite a lot to drink) they suggested we all try a ouija board. The DW told us ages used it a lot when younger and that the same spirit always talked to her.
So we get set up (they down a few more drinks) and we begin.
The glass zooms around the board almost straight away, DW is taking it all very seriously until her DH started giggling. Turns out he was deliberately pushing it around. He's banished to the other side of the room, my DH follows as he's struggling to keep a straight face.
So we continue (after she's topped up the booze) the glass is now going back and forth over and over and over. DW is getting increasingly annoyed with the spirit, demanding it stop playing games with us and make sense. I notice that she is very clearly pushing the glass back and forth, but is apparently so wasted by this point she has no idea what she's doing. I gently point this out, only for her to freak out as now she thinks she's possessed.
She then tells us a story of the spirit that normally talks to her, as "proof" that the spirit really existed and really knew stuff, she told us that it had revealed a secret that no-one else knew - the secret was that she'd once let an ex give her a golden shower. Turns out her DH didn't know and really wasn't happy with the new knowledge.
The evening ended with me pretending to "cleanse" their house of evil spirits with my tarot deck, as it was the only way to get both of them to calm down.
We never went back over for drinks again.