I just acknowledge that some people I know have had experiences with things they can't explain and leave it at that. I put a wall up on that stuff. It's not real. And when it is, there's a rational explanation.
Ghosts and such are simply a manifestation of our primal fear of dangerous creatures and when we see something we can't quite explain, we become terrified.
No, I don't believe in ghosts, nor do I believe in 'spiritual objects" like Ouija boards and stuff like that.
Fun fact: Apparently if you close your eyes while using a Ouija board, it just spells out gibberish. It has to do with telekinesis waves in your brain or something :S