Perhaps one positive of lengthy trans-Pacific flights is that they give ample time to come up with a storyline and score to a musical. Or so it would seem watching “Waterfall. “ The banal and uncomfortably saccharine production is so ill-thought out and simplistic, one could honestly believe that it was written on cocktail napkins during a 12 hour flight.Speaking of cocktail napkins, the story itself reads a bit like “Drunk History,” Thai-style. Historical inaccuracies abound, and attempts at edginess fall flat. The set is impressive, if not garish and overdone. Perhaps it’s the allure of Thai heartthrob Bie Sukrit (Noppon) that brought the folks in, but I along with many others didn’t make it to intermission. The dialogue is stilted, and it quickly becomes painfully evident that Sukrit has merely memorized words, and doesn’t understand their meaning. The total lack of chemistry between Noppon and Katherine makes hackneyed “forbidden love” storyline impossible to believe.