Rudolf Ising (1931)
You Don’t Know What You’re Doin’! is a 1931 Warner Bros. Merrie Melodies cartoon short directed by Rudolf Ising. The short was released on October 21, 1931, and stars Piggy, one of the series’ early recurring characters. First released on October 21, 1931, the film is perhaps one of the most amusing and effective of the cartoons from the studio’s earliest years.
The musical soundtrack was done by the then-nationally famous Abe Lyman Orchestra, which adds a happy energy throughout the cartoon. The eccentric virtuoso trombone playing of Orlando “Slim” Martin is prominently featured. Martin played not only music but also some rather bizarre effects on his horn. His trombone solo representing the drunken automobile is especially memorable. The Schlesinger Studio had their sound effects department construct mechanical devices to roughly reproduce some of Martin’s sounds, which became standard cartoon sound effects.