On September 11, 2001, Mroszak called into "The Howard Stern Show;" from his rooftop in Williamsburg, Brooklyn. By then the Stern Show was one of only a couple of local broadcasts still on the air. Cabbie helped explain that airplanes that people witnessed in Manhattan were United States Air Force fighters sent to patrol Manhattan airspace. He described the action of that horrific morning to the listening audience. He received numerous plaudits for his live coverage and description of the unfolding events.