Attention, sequel sufferers: If you're already bleary and reeling from too many hard-sell blockbusters, Rob Reiner offers welcome relief. Reiner's fifth feature, following This Is Spinal Tap, The Sure Thing, Stand by Me and The Princess Bride (not a loser in the bunch), is a ravishing, romantic lark brimming over with style, intelligence and flashing wit. The movie begins with a man and a woman in a car, and the car doesn't crash. That's the first thing that wins you over.

Reiner and screenwriter…