The Wem Town Hall Ghost Photo, one of the most famous of the ghost-revealing photos, gets the treatment of some dedicated investigators. Was the 1995 snapshot taken during a fire at the British town's town hall faked? Here's a link to the article on Forgetomori:
http://forgetomori.com/2009/paranormal/ghosts/the-second-best-pareidolia-a-hoax/
Could it be just a form of pixellation? (sp?)