What is it?
Fear of butterflies.
The savagery of nature can be chilling. Lepidopterophobes remind us that were it not for the advent of long sleeve shirts, we would all be completely exposed to the rabid butterfly hordes fluttering about. Despite their taking great pains to warn humanity about the iradescent-winged scourge at IHateButterflies.com, the rest of us stubbornly insist on living our lives in relative calm. Guess who will be laughing last when our bones are picked clean by voracious butterfly proboscises?
Nicole Kidman. So if you were wondering what sort of person believes butterflies are a source of unspeakable peril, first ask yourself if this person would buy into Tom Cruise's heterosexuality long enough to marry him. This principal of psychology is not formally called the Nicole Kidman Principle, but give it time.
Though in all fairness to Nicole, we don't know if this psychosis predates exposure to Cruise or not. If Katie Holmes succumbs to the phobia we'll have confirmation that he's the outbreak monkey for this particular brand of crazy.
Worst case scenario for a lepidopterophobe:
Sitting in the back row of a Phish concert, guaranteeing a dozen of these in view at any time: