What has being the only people in the universe got to do with ghosts or the paranormal?

I'm not narrow minded at all, but I'm hyper-critical. Give me one example of a paranormal event that has yet to be accurately/conclusively explained away by science, and then I will take a closer look.

Paddy - so you don't believe in god and religion, yet you do believe in ghosts? Did you know Santa Claus wasn't real too?