Myotonic "Fainting" Goats
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A fainting goat is a breed of domestic goat whose external muscles freeze for roughly 10 seconds when the goat is startled. Though painless, this generally results in the animal collapsing on its side. The characteristic is caused by a hereditary genetic disorder called myotonia congenita. Older goats sometimes learn to lean against something to prevent their falling over, and often they continue to run about in an awkward, stiff-legged shuffle.
http://en.wikipedia.org/wiki/Fainting_goat