Fainting goats have developed the most stupid evolutionary trait imaginable. This is the sort of animal that creationists will point to to demonstrate that Darwinism is a load of cobblers.
“Oh, what’s that? A lion? I think I’ll have a lie down.”
The video under the link explains it all, but basically, due to a genetic condition (myotonia congenita) the goats legs stiffen when they’re suprised or over-excited. Often leading to them falling over. Apparently shepherds used to include them in herds with their sheep as wolf fodder. Now they’re being bred for novelty value. Poor goats.