Humpty Doo is a small town just outside of Darwin in Australia's Northern Territory. According to some, there is a poltergeist there. If there is, then that would be about all that is there, apart from the The Big Boxing Crocodile.
It was once a site of much unsuccessful agricultural experimentation, primarily with rice, but some buffalo got in the works. These days, it is basically on the outskirts of Darwin, and rather than a town in its own right.