Kazuo Uyeda demonstrates his hard shake:
From an article in the NY Times about cocktail shaking:
Mr. Uyeda, who owns a bar named Tender in the Ginza district, is the inventor of a much-debated shaking technique he calls the hard shake, a choreographed set of motions involving a ferocious snapping of the wrists while holding the shaker slanted and twisting it. According to his Web site, this imparts, among other things, greater chill and velvety bubbles that keep the harshness of the alcohol from contacting the tongue, while showering fine particles of ice across the drink's surface.