If the history of cinema tells us anything, it's that actors who are romantically active off-camera generate almost zero chemistry on it: Think of Meg Ryan and Russell Crowe in "Proof of Life," for instance, or Tom Cruise and Nicole Kidman in "Days of Thunder," "Far and Away" and "Eyes Wide Shut."

All evidence to the contrary, therefore, Brad Pitt and Angelina Jolie must have been doing nothing of consequence in "Mr. and Mrs. Smith," because the chemistry between them is positively nuclear.

As competing assassins who've unwittingly married each other's cover identities -- he thinks she runs a temp agency, and she thinks he owns a construction firm -- until they suddenly become one another's targets, Pitt and Jolie go from plain-vanilla suburban boredom to forging a smoldering, twisted and undeniably sexy connection as they shed their various masks (and layers of clothing) to finally unveil their true selves.

But when a botched job puts them in each other's sights, all the secrets come out -- and, ironically enough, the two rivals wind up forging the genuine bond of trust and respect that marriages are supposed to be built upon in the first place. Doing it in the middle of the best movie car chase in years is just, you know, a bonus.

But as good as Pitt and Jolie are -- and they are very, very good, sending up their outsized personae with just enough edge that you still take their characters seriously -- the lion's share of the credit goes to director Doug Liman. As he did with "Swingers," "Go" and particularly "The Bourne Identity," he invests every frame of "Mr. and Mrs. Smith" with so much depth, charm and intelligence - to say nothing of delirious cinematic style -- that you'll find yourself thinking this is the way all movies should be made. And you'll be right.

Fox's enhanced-widescreen DVD offers a DTS soundtrack, which means the extras are pretty limited -- and suggests the studio is prepping one of its double-disc reissues for sometime next year.

This disc offers three audio commentaries (one from Liman and screenwriter Simon Kinberg, a second from producers Akiva Goldsman and Lucas Foster, and a third from editor Michael Tronick, visual effects supervisor Kevin Elam and production designer Jeff Mann), three deleted scenes and a segment of Fox Movie Channel's "Making a Scene" devoted to the shooting of Pitt and Jolie's first firefight.

And that's it. It would have been nice to see the original ending, which Kinberg and Liman discuss in their commentary track with some trepidation, but they're probably saving that for the reissue.

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