S1, E12: The school that Bibi, Marita and Johnny attend is falling to pieces. The plaster is falling off the walls, the windows are leaking and the furniture is rotten. They write a petition to the Mayor, but he is too involved in the preparations for his splendid new Town Hall and hasn't got any money. Bibi turns herself into the teacher and the Mayor into a pupil so that he can see what condition the school is in. And what a surprise - he is the first to demand a new building! Unfortunately, Bibi has forgotten that she is a witch. So Barbara has to change them all back again. In the end a new school is built instead of the Town Hall.