Cops is a 1922 comedy short silent film about a young man (Buster Keaton) who accidentally gets on the bad side of the entire Los Angeles Police Department during a parade, and is chased all over town. It was written and directed by Edward F. Cline and Keaton.
One of Keaton's most iconic and brilliantly-constructed short films, Cops was deemed "culturally, historically, or aesthetically significant" by the United States Library of Congress and selected for preservation in their National Film Registry in 1997.