The world's shortest philosophy books

Researchers at Mississipi University have uncovered some largely unknown 'shorter classics' of the world's best-known philosophers (in fact, shortest classics) that might challenge the view that they're largely humourless. They include:

• Coping with Change by Parmenides
• Watch Your Waistline by Peter Abelard
• How We Can Make this a Better World by Gottfried Leibniz
  
• The Wit and Humor of Immanuel Kant
  
• What I Learned from the Noumena by Immanuel Kant
• Nietzsche's Logic
  
• What Next for Capitalism? by Karl Marx
  
• Our Natural Rights by Jeremy Bentham
  
• Things I Haven't Reconsidered by Bertrand Russell
• Ethical Theory by Jean-Paul Sartre
• Things to Say about Whereof One Cannot Speak by Ludwig Wittgenstein
• What I Really Meant by Jacques Derrida, and
• Our Duties to Others by Ayn Rand

If you need to, ask a passing philosopher to explain the jokes.  [Hat tip Stephen Hicks]