In early March, the women's lacrosse teams at North Carolina and Duke made Spring Break videos patterned on Justin Beiber's cover of Carly Rae Jepson's song and launched 2012's best viral sports craze. By the end of April, dozens of other college teams had responded with "Call Me Maybe" videos and the craze went national when Harvard's baseball team (16 million views) and the U.S. Olympic swim team (10 million) got in on the act.