The Science of Bad Neuroscience
Sometimes things just go wrong and currently in the field of brain imaging, an awful lot of things have been going wrong. This is well illustrated by the now famous study of the dead fish in the brain scanner. A result was found in two different trials where a dead fish was asked to determine facial expressions.
http://neurobonkers.com/2012/08/21/the-science-of-bad-neuroscience/