Theater review: 'Dirty Dancing -- the Classic Story on Stage' at National Theatre

Bum . . . ba-bum / bum . . . ba-bum / bum . . . ba-bum . . . The electric beat kicks in and the audience whoops as three silhouetted couples dip and grind to "This Magic Moment" behind a scrim splashed with a "Dirty Dancing" graphic in hot pink.