2000 vs. the Mets- San Francisco wins first game, Mets win the next three.
2003 vs. the Marlins- again SF wins the first game only to lose the next three.
The other time it happened was 1999, the Astros won game 1 vs. the Braves only to lose the next three.
What's really freaky is that the three teams that lost that first game made it to the World Series.