Since Benno Geyer fails to pass his Abitur due to his panicky exam anxiety, Dr. Fritz Geyer enrolls in high school under his brother's name. As a model student, he has no trouble getting good grades, but he quickly becomes unpopular among the students. From then on, he tries to impress with the craziest pranks.

The five guys of the band "Sunny Boys" go to Polynesia, where they are forced by external circumstances to throw themselves back into women clothes.

Kummerow, a village in North East Germany, around 1900: Mean-spirited miller Düker wants to drive cowherd Krischan out of the village. Being popular with the local children, Krischan can rely on the help of schoolboys Martin and Johannes and their friends, who try to prevent the miller's plans by playing pranks on him.

The captain Paul Heider enjoys the reputation of a Danube Casanova.