The bus is acting up on their field trip to the bakery , and it shrinks .
On Ms. Frizzle 's birthday , the kids in the class want to throw a surprise party for her , but they do not have a cake .
The bus is acting up on kids ' field trip to the bakery , and it shrinks .
On Ms. Frizzle 's birthday , the kids in the class want to throw a surprise party for her , but they do not have a cake .