Se7en (1995)

In David Fincher's crime thriller:

• the ingenuity of the clues at the various murder scenes (none of which were seen committed)
• the unforgettable, nail-biting, concluding climax in which maniacal serial killer John Doe (Kevin Spacey) led arrogant, hotshot replacement Detective David Mills (Brad Pitt) and retiring veteran Detective William Somerset (Morgan Freeman) to another sick and gruesome crime and souvenir - "her pretty head" (a severed head, never shown) delivered in a bloody cardboard box; Doe confessed to the sin of Envy before killing Mills' pregnant wife Tracy (Gwyneth Paltrow) and having her head delivered to their location in the middle of the desert: ("Because I envy your normal life, it seems that Envy is my sin - she begged for her life, Detective. She begged for her life, and for the life of the baby inside of her. (To Somerset) Oh, he didn't know")
• the lurid demonstration of the last of the Seven Deadly Sins (gluttony, greed, sloth, lust, pride, envy and wrath) - to demonstrate Wrath, anguished and angered Lt. Mills vengefully shot Doe in the head, and then emptied his gun of bullets into Doe's body, in exchange for his pregnant wife's beheading
• Det. Somerset's final words (in voice-over): "Ernest Hemingway once wrote, 'The world is a fine place and worth fighting for.' I agree with the second part"