Sauron

http://news.bbc.co.uk/2/hi/science/nature/3046179.stm

Ghostly magnetism explained

By Arran Frood


British psychologists have published research findings which they believe go some way towards explaining why people think they see or feel ghosts
[...]

The study - in which hundreds of volunteers were taken around two allegedly haunted locations - found that people reported having more unusual experiences in the specific places at each location which are considered most haunted.
[...]

"When the shapes of these magnetic fields are reproduced in the laboratory and generated across the brains of volunteers 'the sensed presence', fear, and other experiences are reported," said Dr Michael Persinger, of the Laurentian University, Ontario, Canada

Lobstrosity

Hmm, it appears dead people and magnetic fields are intimately intertwined. I propose we modify Maxwell's curl B equation to include the time derivative of dead-person flux through an Amperian loop.

Big Spoon

I saw a prgramme on that subject, apparently certain magnetic fields can stimulate areas of that brain that cause nightmarish hallucinations. There was a girl that was plagued by ghost visitations in that night, and they discovered that a clock by her bed gave off just the right kind of magnetic field.