Nolensville (Tenn.)  Elementary principal Ryan Harris told students he’d wear the school’s cardinal mascot costume if they raised $14,000 in the PTO fun run. But that’s not all. For each grade, the class that raised the most money could ask him to do something funny while in costume. It worked—students raised more than $20,000. At the request of students, Harris showed off his dance moves and sang Justin Bieber’s hit “Baby.”