Knock Knock!
Who's there?
Cugat.
Cugat who?
Cugat to love my knock knock jokes!
Knock Knock!
Who's there?
Crock and Dial.
Crock and Dial who?
Crock and Dial Dundee!
Knock Knock!
Who's there?
B2
B2 who?
B2 school on time!
Knock Knock!
Who's there?
Joplin.
Joplin who?
Joplin anytime you like!