The listing, Knock, Knock, who's going to bid on this? has ended.
My daughter has outgrown this book but, dang, it's still funny:
(1) Knock, knock. Who's there? Felix. Felix who? Felix-cited to see you Mom.
(2) Knock, knock, who's there? Sarah. Sarah who? Sarah doctor in the house?
No minimum credits needed to bid and free S&H