Knocking At Castle Door In Medieval Obidos-portugal by Ruth Hager. purchase print:’s been more than six years since we created SFF knock-knock jokes, so let’s try it again!

Create and share your own (must be original) SFF-inspired knock-knock joke.

The one that makes us laugh the hardest (or groan the most) wins a book from our stacks.

Here is a groan-worthy joke from our previous contest:

Knock knock.
Who’s there?
Ron who?
Ron away! The spiders are coming!