Tracy's pregnancy in Se7en

In Se7en's intense finale, Detective Mills learns that the serial killer John Doe has murdered his wife, Tracy, and placed her head in a box. Doe reveals this horrifying truth, taunting Mills by mentioning Tracy's pregnancy, which Mills didn’t know about. Overcome with rage and grief, Mills ultimately succumbs to his anger and shoots Doe, completing Doe’s planned "seven deadly sins" murders with Mills embodying "wrath."