Famous for his comic portrayals of a wistful innocent with horn-rimmed glasses who blunders in and out of hair-raising situations, American movie actor Harold Lloyd was the most popular film comedian of the 1920s. He appeared in over 500 films, including many shorts, spanning both the silent and sound eras. Noted for his use of physical danger as a source of comedy, he performed his own stunts, famously hanging from the hands of a clock far above the street in an iconic scene from what film? Discuss