In which 1980 film do the heroes insist "We're on a mission from God"?

Proverbially, you can have one on your back or make one out of someone. What is it? In which 1980 horror film does a boy scrawl "REDRUM" on a door? Which 1980 Best Picture winner, Robert Redford's directing debut, has a title meaning "regular folks"? The 1980 film "Coal Miner's Daughter" was a biopic of which country singer? In 1980, which school headmistress shot and killed "Scarsdale Diet" author Dr. Herman Tarnower, claiming it was an acci… Which village, southeast of St. Regis Falls, hosted the 1980 Winter Olympics? In which 1980 film does a battered boxer taunt Sugar Ray Robinson: "You never got me down, Ray"? Around 1980, bands like the B-52's, the Cars and Blondie were classified as which style of music?