Lately, every movie with the word "Children" in its title seems to be a gem. (See "Little Children.") Starring the always dependable Clive Owen, "Children of Men" portrays a nightmarish future that seems quite plausible. When I wasn't covering my eyes during the harrowing chase sequences, I was wiping away tears during the heart-wrenching scenes. A very intense ride. Michael Caine's turn as a hippie-yippie is lots of fun. But this is definitely Clive Owen's flick. He's an ace at playing the brooding and vulnerable character.