Junie B. Jones is having a terrible week, and her big mouth is about to get her into the biggest trouble yet. Kindergarten has been unusually rough lately. First, Junie B. got in trouble for shouting out in class without raising her hand. Then, she received a stern lecture for eating a piece of dirty candy she found in the grass. But her biggest problem of all is happening on Monday. It is Job Day at school, and everyone is supposed to dress up as what they want to be when they grow up. In a moment of panic, Junie B. brags to the entire class that she has the absolute bestest job of anyone. There is just one tiny issue: she has absolutely no idea what that job actually is! Now, she has to scramble to invent the most amazing career ever before she has to stand in front of Room Nine.