My Ouija experience was when I was in 5th or 6th grade. My folks were at work, and it was summer. Buddy comes over with his board, so we close the blinds, light a candle, and start trying to get it to work. After about 15-20 minutes of nothing happening, my buddy yells at the board "Goddammit, show me a fucking sign if you're there." And the glass candle exploded. We flipped the lights on, and when I looked at the remnants, noticed that the wick had burnt to a point where it was leaning against the glass. So we rationalized that the wick caused the candle to explode.
My buddy gets up to go to the bathroom, and while he's in there, it's quiet, except for the tick-tock of the Cuckoo Clock hanging right by the bathroom. Now, this clock hadn't worked in years, if you hit the pendulum, it would work for about a minute or two, but then stop. When my buddy came out of the bathroom, I asked him why he hit the pendulum to freak me out. He said he didn't hit it. I said he was full of shit, stood up to grab it. Just as my hand reached for it, the pendulum stopped completely mid-swing. Didn't come to a gradual stop, which one would expect. It was almost like someone grabbed it to stop before my hand got to it.
And I've never wanted to do Ouija since.