Just sayin’.

No baseball team ever had come back from a 3-0 deficit in games to win a playoff series … until the Boston Red Sox memorably did it against the New York Yankees in the American League Championship Series in 2004.

But six years later, fans in Boston may not be celebrating that precedent-setting moment … as much as worrying about the possibility of two of their teams blowing 3-0 series leads in the same spring.

Six years ago, no team had ever come from 3-0 down to win a best of seven in either Major League Baseball or the National Basketball Association. Talking more than a century of baseball history, six decades of NBA history.

It had happened in the National Hockey League, but only twice.

Then came the 2004 postseason, and the Red Sox down 3-0 in games, and 4-3 in the bottom of the ninth inning with Mariano Rivera on the mound to close it for New York. The Red Sox won the game 5-4 in extra innings, then ran off seven consecutive victories to eliminate the Yankees and sweep the St. Louis Cardinals in the World series.

Boston had done something no one had done. Come back from 3-0. Beantown went crazy.

But now … the chokes are on Boston.

Two weeks ago, the Boston Bruins completed an epic collapse by blowing a 3-0 lead in games … as well as a 3-0 lead in Game 7 of their conference semifinals series with Philadelphia, losing 4-3.

It was a gut-wrenching event for Boston pucks fans, whose team had been sunk in mediocrity for so long.

It also was the first 3-0 come-from-ahead series defeat in the NHL since 1975 (New York Islanders over Pittsburgh). And it was only the third ever, the first coming in 1942 when Toronto defeated Detroit.

And now?

Remember how the Boston Celtics’ fans were chanting’ “Beat L.A.!” after their team went up 3-0 on the Orlando Magic just a few days ago?

The Celts since have lost an overtime game at home (hmm, sort of like the Yankees failing to finish off the Yankees in 2004?) … and been crushed in Orlando, last night, 113-92. And suddenly that series is 3-2, and the Celtics are two defeats away from making NBA history.

No NBA series ever … ever … has seen a team take a 3-0 lead and not win. Not in 93 previous 3-0 series.

This would be a massive choke that would be so extreme … and coming just weeks after the Bruins’ epic collapse … that it might even provide some cosmic balance to those overly smug Boston fans who have been gloating about 2004 for six years now. And all those Patriots victories in the Super Bowl, and the Celtics’ 2008 title and the Red Sox’s 2007 championship …

How does it go? “Karma is a bitch”?

Just sayin’. Most people probably believe the Celtics can win one of two games. Presumably Game 6, in Boston.

But if the Celtics show up a little flat (and they will show up battered, given that Glen “Big Baby” Davis suffered a concussion last night, and Rasheed Wallace left with a bad back) … and Orlando takes Game 6 …

We will be in position to see two historic collapses in the same spring by Boston teams.

And, actually … Boston fans bug me. Their teams have won far too often over the past decade, and they are smug and annoying.

I wouldn’t mind seeing them suffer. I know that they will.

We are two Celtics defeats from Boston fans remembering 2010 as the year of the “Silent Spring.”