Hundreds of movies have been made about serial killers and the police officers hunting them down, but David Fincher’s “Zodiac” (2007) stands apart because of its more grounded approach. It chronicles a police investigation that begins in San Francisco in 1969 and ends in 1991. Along the way we follow smart police officers who do their best to narrow down a long of list of suspects, and reporters who try to figure out what to do when the killer sends them letters detailing his crimes. These are all intelligent people trying to outsmart a cerebral killer. Yet there is also a surreal sense of humor as the story unfolds. The manhunt and one of its detectives ended up being the inspiration for “Dirty Harry” starring Clint Eastwood. Imagine sitting in a movie theater watching an actor playing that detective who is watching the movie that was inspired by his work. When I first watched that scene and the rest of the movie, it was my first time watching a movie at Toronto’s Scotiabank T...