World's Greatest Dad full movie online on FMovies. Robin Williams stars as Lance Clayton, a man who has learned to settle. He dreamed of being a rich and famous writer, but has only managed to make it as a high school poetry teacher. His only son Kyle (Daryl Sabara) is an insufferable jackass who won’t give his father the time of day. He is dating Claire (Alexie Gilmore), the school’s adorable art teacher, but she doesn’t want to get serious --