Double Indemnity

Everything About Fiction You Never Wanted to Know.
I killed him for money, and for a woman. I didn't get the money, and I didn't get the woman. Pretty, isn't it?
Walter Neff

A 1944 Film Noir, directed by Billy Wilder, written by him and Raymond Chandler, and adapted from James M. Cain's earlier novel of the same title, Double Indemnity is considered by many to be the definitive Film Noir and the popularizer of many of its tropes.

Walter Neff (Fred MacMurray) is a successful but bored insurance salesman who encounters Phyllis Dietrichson (Barbara Stanwyck) when he comes to her house to discuss automobile insurance. After the two have traded some innuendo-laden banter, Phyllis reveals that her marriage is not a particularly happy one and the pair end up conspiring to trick her husband into taking out an accident insurance policy -- and ensure that he then meets a tragic "accidental" end.

Neff, who has eleven years' experience in the insurance business, believes that he has the brains to pull off The Perfect Crime. The only obstacle is his colleague and friend Barton Keyes (Edward G. Robinson), the brilliant claims manager who can spot a phony insurance claim a mile away.

The story is told in flashback and narrated by Neff, who is making a confession into his office Dictaphone.

Tropes used in Double Indemnity include:

Phyllis: Because you don't want the money anymore even though you could have it because she's made you feel like a heel all of a sudden?

Phyllis: We're not the same anymore. We did it so we could be together but instead of that it's pulling us apart, isn't it, Walter?
Walter: What are you talking about?
Phyllis: You don't really care whether we see each other or not!
Walter: Shut up, baby. [kisses her]