Knock, knock. Who's there? Knockers!

Knock, knock. Who's there? Knockers!
Knock, knock. Who's there? Knockers!
Knock, knock. Who's there? Knockers!
Knock, knock. Who's there? Knockers!
Knock, knock. Who's there? Knockers!
Knock, knock. Who's there? Knockers!
Knock, knock. Who's there? Knockers!
Knock, knock. Who's there? Knockers!