It counts. Not scary to everyone but to some b/c it's something you can't see and understand. Since it's not explained well and not seen but is 'unknown' and not an everyday thing...they're scary. Something like that at least.... Also, people aren't sure what to expect maybe? Like someone above said...they can be 'evil' or can hurt you. So people will fear something that can hurt you...but you can't do harm to. ^_^"

Maybe because you can't see or kill them.

Maybe because they have connections with dead people... I dunno...

i think it is because people who believe in heaven or hell or other places of the kind dont want to deal with the idea that there are those who have died and have not gotten to one of these places and they do not want the same fate for them selves