We’ve seen various flash mobs, usually happening at shopping malls, train stations and even airports, where a group of people will suddenly break into dance to the music that will play out of nowhere. Now for the first time it happened during a graduation ceremony!

After valedictorian Colin Yost of Portsmouth High School uttered his final remarks, “All you have to do is Shake It Off,” the Taylor Swift hit song started playing on the speakers and the entire graduation class breaks into dance synchronized to the music.

This viral video has gotten more than 1.5 million hits on YouTube since June 13, 2015.