Two separate newspapers reported on the Gracie Allen method of learning the ukulele. Having watched Ms Allen play, it’ll be good advice to follow:
The Evening Independent (8 November 1938):
Gracie Allen, who is learning to play a ukelele for a scene in “Honolulu,” explains the ease in learning to play the instrument. “All you have to do,” says Gracie, “is to scratch your tummy for a while and then put a ukelele there.”
A more dignified report from The St Petersburg Times (16 November 1938):
Visiting on the “Honolulu” set, I found Gracie Allen strumming a ukelele — and doing a masterly job of it. “It is hard to learn?” I asked and she grinned like a Cheshire Cat. “Dead easy,” she said. ” “You just scratch your stomach rhythmically — then insert the uke!”
I think she was refining the joke as she was improving her strum.