You ain""t heard nothin"" yet![Note: Jolson was actually promoting the title of one of his songs,You Ain""t Heard Nothin"" Yet(written by Gus Kahn and Buddy de Sylva), that he had recorded in 1919.You can""t hurt me.You""re in my world.And you can""t ever leave." He then described his motivation to leave her for last - permanently: "I had to keep you awake long enough so when you finally slept, you""d never wake up again.At the base of the lit staircase inside he front lobby of the apartment building, he waits and listens - almost hiding like he is on a voyeuristic spy case, and then descends one flight of stairs to her apartment door.He excitedly described his latest thematic "prologue" idea o Nan Prescott (Joan Blondell) - his unglamorous, yet very competent, sensible, thoughtful and intelligent Girl Friday secretary:"I got an idea.