What are some movies that provide true insight into a job or situation?

There are some movies that show a particular job or situation in such a way as to evoke nods of understanding from people who have been in that situation. One example for anyone who’s ever worked retail is “Clerks” – sure, it’s above and beyond what really happens, but it’s true in so many ways. Another example is “Office Space” for anyone who’s ever worked in a dysfunctional office environment. A third might be “Precious,” a movie that shows the world from the point of view of an abused girl.

You know a movie fits this category when you want to make people watch it so they understand a little bit of what it’s like to be there.

I am seeking other examples of movies like this, and the groups of people with whom they resonate. Can you think of any, and what makes them so spot-on?