A fight in jest became a full-on brawl on Friday after a 17-year-old Battambang student accidentally picked on the wrong classmate.

The teens had separately left class to go get water, and when one of the students approached the water fountain, he smacked the back of what he assumed was his friend’s head.

The pupil responded poorly to the friendly blow, taking up rocks and fisticuffs to retaliate. Police intervened when the scrape turned serious, arresting one student and carting the other to the hospital. KAMPUCHEA THMEY