Charlie and Spike are two very cute kittens that are normal in all respect, except when they hear a sudden noise:

at the slightest sound, the kittens respond by collapsing and falling into a rigid paralysis which lasts about a minute before they return to normal. This condition has hardly ever before been diagnosed in a cat, is rarely found in dogs and is more common in goats.

See a video clip of the fainting goat kittens over at VideoSift: Link