when i saw in television announce about the story of i be sam and i do not think twice and get the dvd of this movie to watch . first of all and sean penn performance be awesome . he really look a mentally challenged person in all his act and way to move and talk . michelle pfeiffer also have a great performance and be very beautiful in this movie a sam lawyer rita harrison . sam dawson be a mentally retarded man and who have the same capacity of a 7 year old child . he work at a starbucks and love the beatles ( his favorite band ) and one day have a normal daughter with a homeless woman and who abandon him and her daughter when she have the chance . sam take care of his daughter and who he give the name lucy diamond and with the help of his friend and specially annie . ( a piano teacher who be his neighbour ) but time be pass and and when lucy reach 7 year old she understand her father be not normal and intentionally try not to be smart than him and what make her have problem in school . the social service take her away to another family and and sam need the help of a lawyer to win the case . that where rita harrison enters and and she will not only help sam and but learn great value with him . aka uma lição de amor brazil .