knock-knock joke of the day

mary: knock knock.
daddy: who's there?
mary: babana.
daddy: banana who?
mary: babana you!
(45 seconds of hiysterical laughter, then)
mary: knock knock.
daddy: who's there?
mary: babana.
daddy: banana who?
mary: babana you!
(repeat several hundred times, laughing longer & louder w/ each repetition.)