Caffeine Junkies, Musicians, and Californians. Seattle is one of the more hoopy places to visit, or when it comes to it, to live in, explore, or get hit by a passing bus in, and compared to other urban landscapes such as New York and Los Angeles, you can breath the air without seriously needing a new set of lungs at the end of the day. It rains a bloody hell of a lot. If gray skies get you down, you might as well start playing chicken with an Amtrak and get it over with.
Trees are abundant.
Seattle is different, being one of the few places where you have to weed the sidewalk. Coffee that will make a crackhead jittery, knock your blood pressure several zillion times higher than it should be, and in a pinch, will serve as an excellent insecticide. For some reason, most of the Seattle natives will be hard up caffeine addicts. Coffee is the staple food, economic commodity, and drink of choice of the city. If you walk more than a block and don't see an espresso stand, chances are, you're not in Seattle anymore.