End-of year school pranks are raising concerns among Dunedin police who say it may only be a matter of time before someone is seriously injured.
School is finished for senior secondary school pupils who are now studying for NCEA and Scholarship exams which begin on Friday.
Pupils annually play pranks on each other to celebrate the end of the year, and many see it as a rite of passage.
Acting Senior Sergeant Dave Scott said there had been several reports of high jinks and pranking by school pupils in the city during the past three days.
Pranks being reported across the city included pupils from various secondary schools filling school hallways with balloons, covering cars in bubble wrap, and putting burning excrement-filled paper bags on school boarding hostel doorsteps, Mr Scott said.