See Something Say Something

On the Metro buses of King County, there are warning posters which urge you to "See something? Say something!" This one has a picture of someone who looks like someone I know.


What I can't tell is: is the expression on his face supposed to reflect how vigilant the passengers should be in seeking out suspicious people or behavior? Or are we supposed to call 9-1-1 when we see this guy on the bus? He looks like he is up to something, and it ain't good.