Do you know anybody (any friends / family / relatives / disatant relatives ) who is a psychopath?

People who are psychopaths can be the charming, social, and intelligent type, but you never know what they think. Psychopaths can be someone you know, or your average random face you see everyday and give a little smile and shake your head as if you sort of know them, like say "lovely day", or "hello", etc. Do you know anybody who is a psychopath or somebody with sadistic thoughts? Somebody who is ual? Some maniac-sort-of deviant? Somebody with sketchy habits and idiosyncracies? If so, how can you recognize the signs of a psychopath? What do you see that you don't normally see in other people? In WES CRAVEN'S RED EYE, a young building superintendant (Rachel McAdams) makes her flight home and on the way meets a charmer (Cillian Murphy), whom she discovers is involved in a plot to inate a politician or he will have her father killed.