The Best Children's Books of the Year 2014, Bank Street College On "Mood Monday," students describe their moods after the weekend. But Theo doesn't know what to say because he has a new baby sister and is feeling so many emotions all at once. It's Mood Monday and Miss Cady's class is sharing how they feel after the weekend. But Theo doesn't know whether he's in a good mood or a bad mood. He has a new baby sister, and he isn't just happy like Eric who got a new bike or sad like April who lost her dog. As Theo's classmates discuss all their feelings, he realizes he's not in a good mood or a bad mood--he's both those things!.