Me, too, and me, too.
I also know where he got it: a few years ago I was watching a 1930s movie with Billie Burke (you remember, Glinda from The Wizard of Oz? Keep that voice in mind). Billie sat down at a piano and started trilling, “ooooh, tip-toe by the window, by the window, that is where I’ll be . . .”
Light bulb goes on over head–that’s where he got it! He was doing a Billie Burke imitation!