In euphoria that follows the completion of their high school career, members of the Class of 2015 brought scooters to school on the last full day before final exams.

The seniors zipped through the halls as a final act of celebration.

Then just before noon, the class released bagfuls of black and gold balloons in the center hall.

The innocent acts barely interrupted the school day.

Principal Aileen Yadush didn't blink an eye at the harmless pranks but instead co-opted one of the scooters and joined in the fun.