Are Ghosts Real?

For ages, it has been questioned whether or not ghosts are real. Oddly, no one really questions spirituality, though. How do you believe in spiritual presences but say that ghosts don't exist?

It's a very controversial topic. However, some people are said to have captured "ghostly" activity on camera. Others are even said to have audio proof. Check this out:

So, what do you think? Are ghosts real? If not, how do you explain these things?