The answer to that joke is He was mist (He was missed).
If you believe in ghosts, you're not alone: A Gallup poll found that 37 percent of Americans believe in haunted houses, and about one-third believe in ghosts. Tens of thousands of people around the world actively search for ghosts as a hobby with 2,000 active amateur ghost-hunting groups in America. Read more at Live Science.
According to MiamiHerald.com, a southwest Florida couple says a "harmless" ghost is included in the sale of their historic home. Sellers tell the Sarasota Herald-Tribune that they were alerted to the supernatural presence when they bought the Punt@ Gorda home in 2001. Find out more here.