Lasse is a car salesman who has vowed to never get married. He wakes up hung over one morning with a wedding ring on his finger and a nude woman in his bed.

Long-time cohabiting couple Petteri and Liisa wake up with a terrible hangover and realize to their horror that they got married the night before. Throughout the day, the couple argues and reminisces about their previous relationships, but by evening they are ready to reconcile.