Here what happend to one of my course mate house, there are around 5 lady staing in the house. It is a double story house and all the room is on the upper floor. So normally they will switch off all the lights when they go to sleep. One night, my friend stay in her room the whole night, then her room mate go up to he room to sleep. My friend ask is there anyone left downstairs and her friend answer no one and she have off all the lights. then suddenly her friend from the other room knock on the door ask her friend why she didnt off the lights downstairs and she have off it for her. She said no, she have off it on her way up. Then they started to get scare. There is one rumors in that out campus that there is a ghost who travel from house to house looking for somethings. Then 3 off them sleep in the same room that night. The next day her 2 others house mate who came home later at night ask why they didnt turn off the lights and all 3 of the sleep in the same room.