In California someone might join their palms together in a namaste blessing they learned in yoga class, grasp your hand in both of theirs and look into your eyes to make sure you fully connect in a meaningful manner, or else say "yo, dude" and give you a high five, and then five minutes later flip the bird at you as they cut you off on the freeway in their SUV, doing 90 MPH with a cell phone in one hand and a latte between their knees. It's way cool.