The hilarious #1 New York Times bestselling picture book about a chimpanzee in a very bad mood--perfect for young children learning how to deal with confusing feelings.

Jim the chimpanzee is in a terrible mood for no good reason. His friends can't understand it--how can he be in a bad mood when it's SUCH a beautiful day? They encourage him not to hunch, to smile, and to do things that make THEM happy. But Jim can't take all the advice...and has a BIT of a meltdown. Could it be that he just needs a day to feel grumpy?