"Knock Knock"

Sophie: Knock knock!
Stephen: Who's there?
Sophie: Banana
Stephen: Banana who?
Sophie: Knock knock
Stephen: Who's there?
Sophie: Banana
Stephen: Banana who?
Sophie: Knock knock
Stephen: Who's there?
Sophie: Orange
Stephen: Orange who?
Sophie: Orange you glad I didn't say banana?
Stephen: Yeah, but you know what I'd really be glad for you not to say?
Sophie: What?
Stephen: Knock knock
(pause)
Sophie: Okay....Ding dong!