If I had a nickel for every time someone said that to me . . . . Anyway, this cartoon is a very early Looney Tunes/Merry Melodies short from 1931. Our hero, Piggy, picks up his girl for a night of hot jazz at the theater, and he gets into a show-off contest, first with one of the musicians, then with an inebriated audience member. Throw in some bootleg liquor (Prohibition was in effect when this cartoon was released), and things get a bit wild. Nice early jazz soundtrack. From the Internet Archive, here is You Don't Know What You're Doin'.