The reviews I’ve read of “The Box” (now in theaters) confirm my concern: it’s hard to make a 2-hour film from a 2,800-word short story (“Button, Button” by Richard Matheson) without throwing in a lot of stuff that doesn’t really fit (warning: plenty of spoilers at the link).
On the other hand, I ran into the short (7-minute) film above that takes the same basic concept and turns it into something a bit different. Enjoy. ..bruce..