Chicago's students are certainly a resilient bunch. Here are some of the students from the city's Kenwood Academy dancing along to Pharrell's hit song "Happy." The school's principal, Gregory Jones, danced enthusiastically in the video and has been surprised by how popular it's become. "I'm very, very surprised by the reaction," he told the Chicago Tribune. I knew the kids here would watch it, but I didn't think anyone else would. Now we're getting phone calls from alumni who have seen it and I'm getting text messages from all over the country."