Portsmouth High School's 2015 graduates broke into a flash mob during their ceremony, and told everyone to "Shake It Off."

As WMUR reported class valedictorian Colin Yost lead his classmates, saying afterwards, "Oh my gosh, it was amazing. I could not have imagined it coming out any better myself."

Yost added, "We just wanted to do something that had a lot of energy and brought us all together as a class."

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Credit: TNS