In The Big Bang Theory Season 5, Episode 6, "The Rhinitis Revelation," Sheldon Cooper struggles with jealousy when his visiting mother, Mary, spends her time caring for his friends instead of him. After a sulky, rain-soaked walk results in a cold, Sheldon is comforted by his mother singing "Soft Kitty". Read the full episode details on The Big Bang Theory Wiki . Series 05 Episode 06 – The Rhinitis Revelation