Time for a non-Jon post, but still medical.
Remember when Wile E. Coyote baited Bugs Bunny with an iron carrot and ended up pulling satellites out of orbit with his 10,000,000,000-volt electric magnet?
Well, combine the fact that an MRI machine has a huge standing magnet that takes half a day to power down and the fact that many, many things are metal and you get the non-fiction version.
Hmm. It seems to me that MRI accidents are just urban legends. These pictures all look like they were faked up on a movie set in the Arizona desert. Maybe Capricorn 1.