 One night I was studying with a friend upstairs, and we were reading in our books, studying for a science quiz, and all of a sudden she threw her book down and just stared at me. And I looked at her and I was like, are you okay? And she goes, what is that? And I'm like, what is what? And she says, we've been here for about 20 minutes, and three times somebody has walked up and down the stairs, but there's nobody on the stairs.