Petr and Michal would rather not go to school. When they do show up they sleep through their classes because they've been out spraying graffiti the night before. Besides girls, graffiti is the only thing they enjoy: dangerous outings across rooftops, illegal excursions into the heart of the subway, a dramatic climb up a factory smokestack. It's no wonder that their helpless parents are at their wits end and sometimes, in the interest of having their mischievous kids graduate, join forces with the teachers.