There is a well-known case which happened in India where ghosts were being discussed among friends. One of them said, "I don't believe in such things. I am willing to go and sit half the night in the graveyard if you like." His Friends said that they would not believe him unless he did so. He went the same night to sit in the graveyard. Half the night he passed trying to avoid all the threats that his imagination produced before him during that dark night in the graveyard. When the time was over, as he started to return to his friends, his long robe caught in some thorn bushes growing there. He thought a spirit had surely caught him. He fell down and was choked with fear, and in the morning he was found dead.