When it comes to school projects, most children are happy to make do with props such as maps, or models, or even a pet.
But one student at the private Catholic school of Saint-Louise in Paris's 20th arrondissement had other ideas on Monday, showing up with a World World I grenade instead.
Two classes of students were forced to evacuate the premises in the incident, and police were promptly deployed to the scene, Le Figaro newspaper reports.
It is not known where the student obtained the grenade.
This is not the first incident involving classrooms and munitions in France in recent times.
Earlier this year, the father of a young boy was sentenced to 18 months in prison after his son was caught bringing a gun to school.
While the gun was not loaded and nobody was hurt, teachers took the matter seriously and reported the matter to police.