Bimbo the dog refuses to be initiated into the Mystic Order of the Boom Boom a Hotcha by robed figures until he discovers that Betty Boop leads the group and she asks him, "Wanna be a membah?"
Bimbo's Initiation. Directed by Dave Fleischer, animator Myron Natwick. Mae Questel (13 September 1908 - 4 January 1998) as the voice of Betty Boop. 6 min. USA, English. Black and White, Mono (Animation). (1931).