If you are referring to ghosts, the answer is yes. It is so incredibly easy to pull off hoaxes in this area. There is no point in even trying to debunk this crap.
These are interesting:
http://www.ghostweb.com/
http://www.ghostpix.com/
I'm not saying this is "for real", but it is interesting. The "orbs of light" is something that has been observed under peculiar circumstances by people who are not conspiring to precipitate a hoax.