"Knock Knock - Wendy" joke

Knock Knock!
Who's there?
Wendy.
Wendy Who?
Wendy Red Red Robin Comes Bob Bob Bobbing' Along... Knock Knock!
Who's there?
Wendy.
Wendy who?
Wendy wind blows de cradle will rock. Knock Knock
Who's there!
Wendy!
Wendy who?
Wendy go? I never saw him! Knock Knock
Who's there!
Wendy!
Wendy who?
Wendy come to take you away I won't stop them!