A Danish man blew up his local police station when he threw fireworks from the roof into the building to greet friends who were being held in custody inside.
The 34-year-old threw one banger into an airshaft leading into the staff toilet which was destroyed completely when the cracker exploded.
The head of the station in Roskilde said that fire broke out immediately after the explosion.
The man was arrested on the roof of the building and - after the fire was extinguished - spent the rest of the night in the cells with his friends.