An irrational fear of something stupid, inconsequential, and man-made (ref. 666).
Hexakosioihexekontahexaphobia in action...
"Woe to You Oh Earth and Sea
for the Devil sends the beast with wrath
because he knows the time is short
Let him who hath understanding
reckon the number of the beast
for it is a human number
its number is six hundred and sixty six."
-Vincent Price, Intro to "Number of the Beast" by Iron Maiden