Ghost

 A ghost visits the house to use the wifi

An he meets the people who come next

Some lived there and remain in the absence 

Some come for cleaning and doing stuff

Some will come to live where he exactly lived

They all push for witnessing not seeing the ghost

As a member of the house

They slowly change the observed probability of

The wave function of the ghost

into absence in that location

But there is something the ghost wants

And that is to be seen

So its presence can haunt them

And raise the hair at the back of their neck

The won't see him

But what he does 

is what he does