Mr. & Mrs. Smith
Usually in movies, the suspension of disbelief is reserved for the action within the film; when it has to be expanded to cover the plot, that's usually a real bad sign. Not so with Mr. and Mrs. Smith, which successfully floats past the viewer the idea that two people could be married for five or six years and have no idea the other is also a top-notch assassin. It does so with a clever, funny script (is it just me, or is Vince Vaughn funny in everything these days?) and great chemistry between its leading actors, whose real-life "are they or aren't they" relationship notwithstanding have a definite connection on-screen. Imagine Eyes Wide Shut as a somewhat less intelligent action movie. Mr. and Mrs. Smith is simple, effective summer-movie fare; and while it takes the easy way out at the end, director Doug Liman never takes the plot too seriously and thereby sticks the landing on the few serious things the film has to say about marriage.