Why be good when it's so much more thrilling to be bad? asked the ad campaign for this slightly naughty and oh-so-knowing silent-movie celebration of the flapper era. The star of Flaming Youth - vivacious Colleen Moore - again captures the rebellious flamboyance of the Twenties in Why Be Good? She plays Pert Kelly, a shop girl who wins the heart of the boss' son (Neil Hamilton, the Dawn Patrol). The boss, however, doubts that Pert is virtuous. His love-struck son wonders if Dad could be right. So he sets up a little test for his sweetie: He takes Pert to a raucous roadhouse, rents a private room and makes a most ungentlemanly suggestion. Will Pert be good? Or, with Prince Charming in her grasp, will she decide it's better to be bad? the lively direction is the work of William A. Seiter, whose 45-year career included the Golden Age musicals Roberta, Dimples and You Were Never Lovelier.