Always keep watching

In the grand tradition of one of its main inspirations, The Twilight Zone, Black Mirror is extremely fond of twist endings; nearly every episode contains a third-act shock or revelation. (Sometimes, it even comes during the credits, so don’t hit “next episode” until you’re sure things are really over.) Just one example is seen here: season three’s “Playtest,” which borrows from one of the most famous Twilight Zone episodes ever (Ambrose Bierce adaptation “An Occurance at Owl Creek Bridge”), in which most of the action actually takes place in a fraction of a moment as the protagonist is dying.