Do you believe in "traditional" ghosts?

I wrote a squidoo lens based on experiences I had many years ago - don't ask me why I added it to squidoo instead of here, with hindsight I should have put it here but it's too late now, lol.

I don't believe in ghosts, at least not in the normal sense, but I HAVE had four experiences in my life where I saw "something" that was akin to a ghost. I have a very analytical, scientific mind so what I saw really perplexes me. You can read more about it here:

Do you believe in ghosts? How about live ones?