Little Brown is grumpy and lonely at the dog park, until he decides to take matters into his own hands.

Introduces Grumpy Unicorn, the grouchiest magical creature ever, and describes his few likes and many, many dislikes.

A young elephant sees his dad is in a bad mood and tries to cheer him up, not realizing his own mischief caused the bad mood in the first place.

All of the animals are cheerful in Cupcake Wood except Scowl the owl. He is grumpy all the time, which makes it difficult for the other animals, until he finds he isn't the only one who can be grumpy.

When it is "Backward Day," Judy must turn her usual sour mood upside down and be happy and nice for a change.

Ramona's year in third grade is highlighted by the arrival of Howie's rich uncle, a change in her after-school situation, a surprise wedding, a death and a new arrival in the family, and her father's getting a job.

Grumpy Unicorn sets off on a journey to find someone who doesn't totally annoy him, and encounters jackalopes, sasquatches, and lots of adventure along the way.

Waking up in a grumpy mood and feeling that nothing is going his way all day long, Pete the Cat dons a pair of rocking magic sunglasses given to him by Grumpy Toad and learns that a good mood has been inside himself all along.

Mootilda visits her friends Mootilda visits her friends on the farm to alleviate her bad mood, but her day seems to go from bad to worse.

Rhythmic text exposes a bad mood on the prowl, and advises the reader not to hide, but to let those feelings be.