I've had some pretty weird experiences but couldn't say if they were surely ghosts or not. I do believe in them! I don't see how they're all that irrational. It's not like they're some evanescent creatures that haunt old, forgotten houses. It's either just repeating events due to their traumatic nature or a spirit of a dead person that are no different then we are. Once you get into demons and people getting scratched and cut, then I don't know. That stuff is craziness. Oh and I thought this was pretty interesting :
http://www.telegraph.co.uk/news/news...-than-God.html