Tardar Sauce (born April 4, 2012),[1] commonly known as Grumpy Cat, is a cat Internet and media personality and actress. She is known for her permanently "grumpy" facial appearance, which is caused by an underbite and feline dwarfism.[2][3][4] She came to prominence when a photograph of her was posted on social news website Reddit by Bryan Bundesen, the brother of her owner Tabatha, in September 2012,[2][5] and lolcats and parodies created from the photograph by Reddit users went viral. She is the subject of a popular internet meme in which negative lolcats (such as "I Had Fun Once...