ghost stories

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I was wondering..does anyone know any great ghost stories. My younger sister is having a sleepover birthday party and she asked to to tell her little friends a couple ghost stories and have a good but really scary time. I wanna be a good brother, we get along really well. DOes anyone know any good ones. DOnt worry, they are old enough to take really scary or bloody stuff, they are all between 14 and 16. Thanks!!! really appreciated!!!! =)