Flash's Cocktails (CLOSED)

Wedged between the edge of Back Bay and the tail end of the South End, a cute space that once housed a busy cafeteria is now Boston's hippest little cocktail spot, renowned citywide for its penchant for turning classics upside down (which then turn the patrons upside down). As convenient to several choice neighborhoods as it is to a spread of high-end hotels, it draws a mix of people that's almost as complex as the drinks.