Groundhog Day (1993)

The comedy from this decade most likely to be called a perfect movie, and it earns it. Bill Murray's sour weatherman relives one February day in Punxsutawney until he gets it right, and Harold Ramis lets the premise run from prank comedy to despair to something close to grace without ever going soft. It was added to the National Film Registry in 2006, and its title became shorthand for any day that keeps repeating. Watch it again even if you know it well: Murray's slow change is easier to see the second time.