What can I do to make him move?

I dont want to just come out and say get out now! He is living in my shed/mini house without mine or my wifes permission. Our landlord (a friend) said he could because the sheds are her property. Well we are handling that situation by talking to the landlord. We told her it wasnt ok but she isnt going to make him leave. So what can my wife and I do to make him want to move. Are there things we can do to make him so sick of us he wants to get out? My wife is already blasting rap music (which she hates, but she know so does he) into the night but not loud enough to bother the neighbors. Is there anything else like this that we can do. Oh she talked to this guy and he also said he wasnt leaving. If nothing else works we call the cops. So any help that doesnt include telling him to leave would be great.