Rory is a fictional monkey in an allegory Greg Heffley writes for an English assignment, titled "Rory Screws Up". The story is inspired Greg seeing his brother Rodrick working on his van.
In the allegory, Rory lives with a family that loves him very much, even though he constantly screws things up. When Rory accidentally rings the doorbell, his owners reward him, believing the action was intentional. Believing himself to be some sort of monkey genius, Rory overhears his master complaining about his car and endeavors to fix it. Despite trying, he ultimately ends up making things worse and learns a lesson, which is that he is a monkey and monkeys don't fix cars. Rodrick reads the story and says "Monkeys don't understand English, stupid".