David Letterman has been called the crown prince of the current age of irony. His unconventional humor and brash on-air antics have inspired numerous comedians and talk show hosts who have followed in his footsteps. In this profile of the former TV weatherman who once predicted hail stones the size of canned hams, find out how Letterman landed a big break when his unique brand of humor caught the attention of legendary Tonight Show host Johnny Carson, who subsequently helped launch the young comic's career. Learn how Letterman and fellow comedian Jay Leno have endured a robust rivalry through the years, which started when Leno was chosen over Letterman to replace Carson as the new Tonight Show host in 1993. Finally, get an inside look into some of the personal challenges Letterman has had to overcome in his rise to the top, including a determined stalker and emergency quintuple bypass surgery. Featuring hilarious moments from his early career, incisive interviews with friends and film critics, as well as clips from his Emmy Award winning show, Late Night with David Letterman, BIO presents a colorful portrait of one of America's great comedic geniuses.