Naw, I heard it like this~~a long time ago.
Knock, knock.
Who's there?
Little Old Lady.
Little Old Lady, Who?
Gee, I didn't know you could yodel like Eddy Arnold!
Actually, Esther and Abi Ofarim did the "You're the Little Lady, The Little Lady, You're the Little Lady Who!" line (or something similar) on their song, Cinderella, Rockefella.