Visit any cocktail bar, and you're certain to hear the sound of a bartender shaking a drink over ice. It may be a great way to show off, but is it the best way to make some whisky-based cocktails like the classic Manhattan? With some help from Beam Master Mixologist Bobby Gleason and Louisville-area bartenders Larry Rice and Levi Beckley, we'll see whether shaking or stirring a Manhattan makes a difference.