Ghost stories

After dinner we turned the lights out and played 'hide-and-seek'. In the dark, I touched a hand, a very cold hand. Now, because of the game, I had to hide in the dark with ...with this cold person - not speaking, not knowing who it was. Slowly the others found us, hid with us, until we were all there - all thirteen. Thirteen? But there were only twelve people in the house! We touched each other in the dark, counting. Thirteen. Quickly, nervously, I lit a match to see...