The Ball State University Chirper was designed to help Cardinal sports fans intimidate opponents when they line up for a third down under the bright lights of Scheumann Stadium or square up to shoot an important free throw in front of a rowdy crowd of students packed into The Nest at Worthen Arena. By shaking their iPhones and iPods in the air, Ball State fans everywhere can show their Cardinal pride by unleashing the call of "the world's "fiercest robin-sized bird" (according to alumnus David Letterman). Giving the app a shake also activates a hypnotic flash of the Cardinal logo backed by alternating hues of Ball State's school colors: cardinal and white. Go Cards! Chirp! Chirp!