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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A rendering of the columbarium memorial that is estimated to be completed by next summer or fall in the southeast part of Oakland Cemetery, officials said. (Courtesy of Historic Oakland Foundation)

Credit: Historic Oakland Foundation