article_snippet: This is due to  a neurological condition called cataplexy - which triggers episodes of muscular weakness triggered by strong emotions.
article_snippet: The loss of muscle control can range from weakness at the knees to total collapse on the floor.
article_snippet: Reactions to other emotions, such as surprise and anger, could even cause Miss Kelly muscles to become paralysed.
article_snippet: And reactions to other emotions, such as surprise and anger, could even cause Miss Kelly muscles to go into a state of paralysis.
article_snippet: Cataplexy is the sudden, temporary muscle weakness or loss of muscular control.
article_snippet: Cataplexy attacks are usually triggered by an emotion, such as excitement, laughter, anger or surprise.