Knock Knock

Knock Knock! Who's there? Pudding Pudding who? Pudding in your face! Knock Knock Who's there? Snow Snow who? Snow business like show business! Knock knock! Who's there? Hanna Hanna who? Hanna partridge in a pear tree! Knock knock! Who's there? Holly Holly who? Holly-days are here again! Knock knock! Who's there? Harold Harold who? Hark the Harold Angels Sing!