...when I was 13, my best friend and I thought it would be "fun" to have a go. We got out the letters of the alphabet from a scrabble game, and laid them in a cirlce on the wooden floor of her bedroom. We got a glass, stuck in the middle and placed our index fingers on it. We tried to call up a recently deceased person we knew, we also tried to contact my granny. Nothing happened, so I went home...
For a few weeks afterwards, things got weird at my place. Household potplants would shiver and shake for no reason, doors would open or slam, and I'd find things missing or moved. I knew it was connected to the ouija session we had - and I was shit scared!!! In the end, I started to get sick of it, and got a bit pissed off, so I yelled out - "I DON'T WANT YOU HERE, YOU DON'T BELONG HERE - GO AWAY!" Lucky for me, things returned to normal - I was lucky!! I will NEVER do this again - NEVER! It really was a stupid thing to do... Nowadays I feel sorry for what/who-ever I trapped in the mundane world, I hope they are at peace.