This Is Not My Hat

This Is Not My Hat is a 2012 children's picture book by the author and illustrator Jon Klassen. The story is told through the unreliable narration of a little fish, who has stolen a hat from a big fish and how the big fish reacts to the theft. It is a thematic follow-up to I Want My Hat Back (2011) and was meant to be a more literal sequel until Klassen took a suggestion to change which animals were in the story. The book was well received by critics, who praised its dark or ironic humor which could only be understood by comparing the words of the little fish's narration against the events of the illustrations. In addition to several positive reviews, Klassen received the 2013 Caldecott Medal and the 2014 Kate Greenaway Medal, making This Is Not My Hat the first book to win both awards. This Is Not My Hat was also a commercial success.