Haunted House

Will have to check with the landlord to make sure noone has been died (either by murder or in a more benign manner) in the house. I'm currently home alone and there are footsteps uptairs and someone is opening and shutting doors. It's very strange and I'm really hoping that if there is a ghost it's one of those friendly ones (like the green Class 3 free floating apparition green from Ghostbusters) and not one of the nasty ones (like Casper ... Man, anything with a head that big has got to be bad news) ...