There's a curious breed of goats that's found on some farms in central Tennessee that have a condition called myotonia congenita which causes their muscles when they are startled to freeze and get stiff legs for about ten seconds. This is followed by them falling over but without losing consciousness or having any ill effects. They do not actually faint; but show these motor symptoms.They are smaller and friendlier than other breeds of goats, and have protrubing eyes. They are kind of cute. Lewisburg, Tennessee in Marshall County has a goat festival each year honoring "fainting or nervous goats."
Here are some myotonic goats with their characteristic response to a startle.