It's A Wonderful life (Frank Capra, 1946)
"No man is a failure who has friends," Clarence the angel tells George in the ultimate feel-good line. Capra's film suffers from over-familiarity, thanks to its perennial appearance on the Christmas television schedules, but it has an unlikely topicality as the world's economy nosedives. Scandal, ruin, bankruptcy and the prospect of suicide are all banished and the audience is left with that nice warm feeling inside... If only it was for real.