Ms. Krup Cracks Me Up is the twenty-first and final book in the My Weird School series.
Summary[]
The second-graders are going on a field trip to the Natural History museum with the tour guide Ms. Krup. They looked at the diaramas of moose and buffalo. They also saw the dinosaur skeletons and the bugs. Ms. Krup let AJ hold the cockroach General Muffin, but it ran away.
The kids went to sleep in their sleeping bags. A.J., Michael Robinson, Andrea Young, and Emily Pucket snuk to the candy machine and ate all the candy next to it, in the boxes. Then they snuk into the secret room where Ms. Krup prepares the animals for exhibition. She led them into an exhibition called The Amazing World of Poop, which isn't yet opened. They learnt lots of things about poop.
The kids went to sleep again, but then Emily screamed because General Muffin crawled into her sleeping bag. Everybody freaked out, and a giant bear fall on her. Finally, the grown-ups got the bear off her, and ms. Krup captured General Muffin. When they were getting on the bus to go home, A.J. told Mrs Kormel that they learnt about poop.