from musical comedy revue "Face the Music"
Lyrics and Music by Irving Berlin
1932
'Yes, he began singing. Something, if I remember, about there being a rainbow in the sky, so let's have another cup of coffee and let's have another piece of pie. I wasn't at all surprised. I suppose it was a long time since he had a square meal, and pie is very filling. [...]'
Galahad at Blandings. Chapter 4.II
Wilfred mentally ran through his repertoire and decided on that thing about having another cup of coffee and another piece of pie which Tipton had taught him in the course of their revels in New York. He liked both words and music, the work, he had been given to understand, of the maestro Berlin, author and composer of Alexander's Ragtime Band and other morceaux.
Galahad at Blandings. Chapter 9.III