I found this on Martha Stewart and fell in love! My kids love to have Halloween parties and now that they are getting older this would be perfect for them!!!!
No crowd is better primed for a good prank than one listening to a ghost story in the dark. One perfect stunt for storytelling requires hiding a compatriot outside the house; as soon as the tale reaches a crucial, scary section, he starts to rub a well-rosined bow on a violin string that has been affixed to a windowpane. An eerie, weirdly pitched wail fills the room, but its source is inexplicable. For maximum chills, consider adding this trick to the same story session: Candles are placed around the room. As the story nears its climax, they mysteriously go out, one by one, until the room is dark. To achieve the effect, simply cut the candles in two, remove a small piece of the wick from the middle, then join the pieces back together by heating the cut ends. When a candle burns down to the missing section of wick, it gutters and dies.