The answer to that joke is He was mist (He was missed).
If you believe in ghosts, you're not alone. Cultures all around the world believe in spirits that survive death to live in another realm. In fact, ghosts are among the most widely believed of paranormal phenomena: Millions of people are interested in ghosts, and a 2005 Gallup poll found that 37 percent of Americans believe in haunted houses — and nearly half believe in ghosts.
Ghosts have been a popular subject for millennia, appearing in countless stories, from the Bible to "Macbeth," and even spawning their own folklore genre: ghost stories. Part of the reason is that belief in ghosts is part of a larger web of related paranormal beliefs, including near-death experience, life after death and spirit communication. Read more at Livescience.com.
Ghost hunters? Meet Detroit’s haunted spots at Freep.com.