I believe in them. I have two which live in my house. There is a boy who is 19 named Adrian, who was burned to death inside a barn which must have been where my house is standing, and there is a 20 year old girl named Jane who hung herself. Ghosts arent as scary as they seem to be. Most of them are just lost and lonely. There are many bad spirits also, but I choose to ignore them.
The way to see ghosts is not through your eyes.. It's through your mind. If you can sense someone there but only see them in your mind, then you can see ghosts. If you say 'Hello' in your mind, and a voice says something back, then you're speaking to one. Not many people can do it but it's an interesting gift to have. Some of my best friends are ghosts, and many people call me crazy but I don't care.