I'm bored, so I fancied seeing what Bloopers views are on this topic. And it's Hallowe'en soon, so it's seasonal!
When it comes to aliens, I think it would be stupid of us to suggest that we are the only ones out there... there must at least be single celled organisms on a number of planets.
As for ghosts, I'm unsure. I'd like to believe in them, to think that there's something else after we're gone, but I personally have seen no evidence!