Der Witz Und Seine Beziehung Zum Unter Bewussten (or The Joke and His Relation to the Unconscious) is a book seen in the episode "Blenanas". Princess Bubblegum gives it to Finn after she doesn't find his joke funny.
The book is a shade of burgundy, and the title is written in a fancy script inside a white box. Around the white box is a yellow outline.
- This is a real-life book, written by Sigmund Freud, which attempts to understand the psychology of humor.
- This specific version of the book is printed in Gerbrochene Schrift (Broken Script)