@dnerd Look, if you haven't seen one, then its a matter of personal opinion. I don't know what a ghost is. No one does. Weather they are a halluncination or physical beings, it's still a matter of personal opion until you see one. I don't really care if you havent seen a ghost. But I have, and thats why belive in them.
So what,I believe in spirits.Where your spirit go when you died?In heaven or hell (it depends you are a bad person or a good person).I believe in heaven not hell.Some will post "i believe in hell".They just bragging,they think that Satanists are "cool".
@shroom207 The title of this topic implies that you actually want to know what people believe. I agree that it's a matter of personal opinion but to those who are willing to trust in science I suggest you read this: http://en.wikipedia.org/wiki/Infrasound (because wikipedia is very reliable)
From a geeks perspective ghosts are just disturbances in the time-space continuum and/or normal matter universe causing fluctuations in energy levels (I.e light, sound, force) thus giving illusions of visible objects, strange sounds, even floating objects. Given that there are millions of ATP molecules that would be released when someone dies this would cause the fluctuations when someone dies, this giving the theory that ghosts are dead people. So Sixth Sense might as well say "I see energy" As for hell if you know anything about basic exo/endothermic properties you'd know that hell froze over YEARS ago, duh.