Shake the drink, rattle the ice, and roll the drink until it's mixed. The best way to shake it is not by shaking back and forth or up and down. Much like your dentist told you when learning to brush your teeth, a round and round, circular motion works best (hence the 'roll'). This motion really gets the ice moving around and mixes the drink up better. It also keeps the cubes more intact, so they chill the drink rather than diluting it.