Grumpy (1930) is an American drama film directed by George Cukor and Cyril Gardner, and released by Paramount Pictures. The screenplay by Doris Anderson is based on a play by Horace Hodges and Thomas Wigney. A Spanish-language version entitled Cascarrabias, written by Catalan writer Josep Carner Ribalta (1898–1988) and directed by Gardner, was released by Paramount the same year. The film is a remake of a 1923 silent film of the same title.
The titular character is a temperamental but lovable retired London barrister now living in the country with his granddaughter Virginia. Ernest Heron, Virginia's beau, returns from South Africa with a valuable diamond, and that night he is attacked and the gem is stolen. The only clue to the perpetrator's identity is a camellia Ernest is found clutching in his hand.
Suspicion falls upon Chamberlin Jarvis, an acquaintance of Virginia who was a houseguest at the time, and Grumpy follows him when he returns to the city, where he tries to sell the diamond to Berci. Knowing Jarvis is a suspect, Berci turns him away, and the thief, frightened by a confrontation with Grumpy, eventually returns to the country, returns the jewel, and is arrested.