Gua Sha is a movie about the differences between American and Chinese culture. Xu datong is a video games designer in St. Louis. When his father visits from China, he performs Gua Sha on his grandson, which leaves bright red marks on the skin and causes a lawsuit of child abuse. In the court, Datong loses his mind so that finally he loses custody of his son. I think this scene is shocking and thought-provoking to most of the Chinese audiences. But the most impressing scene to me is the ending. Datong wants to see his son in Christmas eve, he has to climb a pipe to the ninth floor which his son lives. I think the pipe is not only a pipe, but also a gap, a deep gap between American and 5000-year Chinese culture. He wants to climb over the gap and he will never succeed, perhaps no Chinese people really could succeed.