Charlie and Spike are kittens with myotonia congenita, also known as 'fainting goat' syndrome. At the slightest sound or movement, the kittens respond by collapsing and falling into a rigid paralysis which lasts about a minute. Myotonia congenita in cats is extremely rare, and the kittens are healthy and normal in every other way. Typically, this condition does not affect lifespan or health in cats.