Scary Noises from Upstairs

Home for the summer from nursing school, my youngest sister-in-law returned to the house with one of her friends after a night out on Bell Blvd. The house was dark and quiet, which almost never happens. She said that she and her friend heard "scary noises" coming from upstairs so they hid in a very small and very full coat closet by the back door and called the cops. The cops arrived and checked out the house. They found my in-laws upstairs in their bedroom with the door locked.