Life Is a Trumpet has a loose jazz musician as the groom, a butcher as his father, and two families of different backgrounds whose members are not as different as one might expect.

Don Fabijan is a young priest who comes to serve on an unnamed small island in the Adriatic. In order to help increase birth rate on the island, he decides to pierce condoms before they are sold. He therefore teams up with the newsagent Petar and the pharmacist Marin. After they abolish all forms of birth control on the entire island, the consequences become more and more complicated.

Matea is a twelve-year-old whiner who hopes her birthday party will make her more popular at school. Nera is a girl at a crossroads in life. An incident in front of a shopping mall could give her a new perspective on things. Miran is a new husband, son-in-law, and a father-to-be who is simply trying to move his things to a new apartment with the help of neighbors who start giving him a hard time. Three neighbors on the verge of a breakdown on a winter's night.