[Nosferatu@Cult Labs]

I just looked at the Wikipedia page for The Box and the was adapted from Richard Matheson's short story for an episode of the 1980s The Twilight Zone series. This is what it says about the adaptations – SPOILER ALERT!

Short story
"Button, Button" was first published in Playboy, June 1970, a short story written by Richard Matheson. The story was republished as part of a collection of Matheson's short stories.

In the original short story, the plot is resolved differently. Norma presses the button, and receives the money—after her husband dies in a train incident where Arthur is pushed onto the tracks (the money was the no-fault insurance settlement, which is $50,000 instead of the $200,000 in the Twilight Zone episode). A despondent Norma asks the stranger why her husband was the one who was killed. The stranger replies, "Did you really think you knew your husband?"

Matheson strongly disapproved of the Twilight Zone version, especially the new ending, and used his pseudonym Logan Swanson for the teleplay.

Film
The Box, a feature film based on this story, starring Cameron Diaz and James Marsden, was released in 2009. The Twilight Zone episode is played out within the first hour, followed by further events within the context of the film's additional plot. Basil Hoffman, the actor who plays Steward in the Twilight Zone episode, also appears in the film, but as character Don Poates