Colin Yost -- Portsmouth High School in New Hampshire's 2015 valedictorian -- wanted something different to close out his graduation speech. So he gathered classmates and school administrators together to organize a giant flash mob set to Taylor Swift's "Shake It Off," much to the surprise of just about every parent in the audience.
Yost tells MTV News that he'd always wanted to try a flash mob and felt graduation might be a great place to start. He sent a private instructional video out to the class of 2015, got administrators on board with the plan and used five graduation rehearsals to get the moves right.