In the twelfth episode of The Big Bang Theory‘s season 7 (S07E12) Sheldon tries to learn how to be funny. On his mission he even studies a book on that topic.
Sheldon chose Jon Macks’ book from 2003 How to Be Funny: The One and Only Practical Guide for Every Occasion, Situation, and Disaster (no kidding).

Jon Macks is an author of several books, is a writer for The Tonight Show with Jay Leno and has written for Academy Awards and Emmy Awards shows, …
The book has mixed reviews on Amazon from “It’s funny and helpful!” to “More sad than funny”.
I guess it’s obvious that the book didn’t help Sheldon in his quest to be funny. :)