The jazzy retro style of Guy Ritchie's "The Man From U.N.C.L.E." is slinky fun, but enjoy it while you can because, like a toddler, if you take your eyes off it for a second to grab your drink or glance at your watch or merely blink, it is gone, a whooshing little breeze where it once used to be on screen and in your mind. The projector might as well be one of those neuralizers from "Men in Black."