Bad Bradley was a book written by Susan after Bradley, a kid who bullied Greg a lot during his pre-school, left the town the Heffley Family lived in. In the book, Bradley was shown as a very bad kid as he poked his fingers in a child's eye and bit a teacher. Susan was getting it published, but Bradley and his family moved back in that time so Susan had to scrap the idea. However, she used it to teach Manny, which Greg believes is the reason why Manny is scared of other kids his age.
- The book might be a parody of "No, David!".
- In the book, Bradley was even worse behaved than the real Bradley. Greg describes the book Bradley as being pretty much the Devil.