I... don't believe in ghosts. Nor in anything supranatural. But sometimes I dream of stuff and then it happens. People say and do the exact same thing than in my dream. It shocked me the first times, but now it's just like 'bah...' And I'm skeptical about it too >_>; Anyway, even if it was true, it wouldn't be useful at all, knowing that someone will say or do something random.... I mean, I don't predict the end of the world. Tried to figure out any sense of them, but I didn't see anything. Just random events.
Anyway... the whole concept of spirits highly interests me, while not making any sense in my mind XD
Wouldn't it be a little crowded by now? And I bet animals and plants don't have an afterlife.. ahh humans so egocentric.... or maybe humans can only see human spirit, who knows. Meh.