Johnny Depp was nominated for a Golden Globe for his astonishing performance in Benny & Joon, though the entire cast is equally impressive. Benny (Aidan Quinn) runs a small car repair shop. He must also take care of his mentally ill sister Juniper, better known as Joon (Mary Stuart Masterson). After losing a bet, Benny is forced to bring another eccentric into his house: Sam (Johnny Depp), the cousin of a friend. Not inclined to conversation, Sam expresses himself by performing Charlie Chaplin and Buster Keaton routines (and brilliantly!) Not surprisingly, he immediately hits it off with Joon. As Sam and Joon fall deeper in love, Benny for the first time in life experiences the pangs of jealousy. As can be gathered by this synopsis, Benny and Joon may not strike responsive chord with everyone; those who like the film, however, are almost militant in their devotion.
~ Hal Erickson, All Movie Guide