Ghostly goings on

Did I tell you the apartment is haunted?  The human thinks it is anyway based on two facts: I will not go into her bedroom even though she keeps putting my bed in there; and the sock!  About a week after we arrived a sock appeared in the middle of the bedroom floor one morning.  A single white sock with a red top.  It's not one of mine and it's not one of hers so if you are missing a white sock with a red band then get in touch.  We are obviously at the other end of your sock vortex!