You will be given a definition of a task first, then an example. Follow the example to solve a new instance of the task.
In this task, you will be shown an extract from a movie plot. You need to read the extract and create questions that can be answered from the extract. Once you create a question you also need to provide the correct answer for it. Write your answer like "Question: your question, Answer: your answer". The questions should be well-formed and grammatically correct. The questions should be completely answerable from the given passage and should not require any external knowledge. Subjective questions are not allowed. Short answers containing words that are present in the passage are preferred. Create questions that result in factoid answers. A simple rule of thumb to decide whether a question is a factoid or not is to see if two different people with average reading/comprehension skills would come up with the same answer after reading the passage.

Twenty-year-old Will Hunting of South Boston is a self-taught, genius-level intellect, though he works as a janitor at the Massachusetts Institute of Technology and spends his free time drinking with his friends, Chuckie (Ben Affleck), Billy (Cole Hauser) and Morgan (Casey Affleck). When Professor Gerald Lambeau (Stellan Skarsgard) posts a difficult mathematics problem as a challenge for his graduate students, Will solves the problem anonymously, stunning both the graduate students and Lambeau himself. As a challenge to the unknown genius, Lambeau posts an even more difficult problem. Lambeau chances upon Will solving the problem but Will flees the scene. That night at a bar, Will meets Skylar (Minnie Driver), a British student about to graduate from Harvard, who plans on attending medical school at Stanford and gives Will her phone number before leaving.
Solution: Question: How old is Will Hunting in the movie ?, Answer: Twenty years
Why? This is a good question which results in a factoid answer, and the answer is correct too.

New input: The plot involves an obsession with the 23 enigma, which is the idea that all incidents and events are directly connected to the number 23, or to some number connected to 23.Walter Sparrow (Jim Carrey) is an Animal Control Officer and married to Agatha (Virginia Madsen); they have a son, Robin (Logan Lerman). At a bookstore, Agatha begins looking at a book titled The Number 23 written by Topsy Kretts. She later gives Walter the book as a birthday present.Walter starts reading the book, noticing odd similarities between himself and the main character, a detective who refers to himself as "Fingerling". Walter begins to have dreams of murdering Agatha. Walter tries to warn her about the number being dangerous and how it was going to come after her. She tells him he is crazy.Walter comes to realize that he is Topsy Kretts, having written the book as a way to rid himself of the guilt he felt over murdering a woman named Laura Tollins (Rhona Mitra). He was never suspected of the crime, and a man named Kyle Flinch (Mark Pellegrino) was convicted and imprisoned instead. Fearing he will hurt his family, he leaves home and moves to a hotel.Agatha finds Walter at the hotel and tries to assure him that he is no longer the person he was when he wrote the book. He insists that he is a killer, accepting the fact that he murdered Tollins, and tells Agatha to leave before he kills her, too. Agatha pushes a letter opener into Walter's hand, saying that, if he is indeed a killer, he can easily kill again and dares him to kill her. She tells him that she loves him. Walter tells her that she can't love him because no one can, mirroring an accusation made by Laura on the night of her murder. He leaves the hotel and runs into the street, where he nearly allows himself to be run over by a bus but steps out of the way at the last minute when he realizes his son is watching. As he embraces his family, a voice-over by Walter tells the audience that he turned himself in to the police and is awaiting sentencing, having been told that the judge will likely go easy on him. A funeral procession takes place in front of Tollins' grave, where it is implied her body has finally been laid to rest, as Flinch observes, finally a free man.
Solution:
Question: What is the obsession involved in the plot ?, Answer: The obsession is with number 23