From Wikipedia, the free encyclopedia. Roscoe Karns (September 7, 1891 – February 6, 1970) was an American actor who appeared in nearly 150 films between 1915 and 1964. He specialized in cynical, wise-cracking (and often tipsy) characters, and his rapid-fire delivery enlivened many comedies and crime thrillers in the 1930s and 1940s. Though he appeared in numerous silent films, such as Wings and Beggars of Life, his career didn't really take off until sound arrived. Arguably his best-known film role was the annoying bus passenger Oscar Shape…