"Knock Knock - Fanny" joke

Knock Knock!
Who's there?
Fanny.
Fanny who?
Fanny body calls, I'm out. Knock Knock
Who's there!
Fanny!
Fanny who?
Fanny body gonna open this door then? Knock Knock
Who's there!
Fanny!
Fanny who?
Fanny Girl! Knock Knock
Who's there!
Fanny!
Fanny who?
Fanny the way you keep saying " Who's there? " everytime I knock! Knock Knock
Who's there!
Fanny!
Fanny who?
Fanny body home!