That moment at the end of a movie (Hackers,
Anti-Trust, Johnny Mnemonic, or The Running Man) in which the bad
guy's evil plans are spilled to the world over one (or several) large screens, often broadcast over a large city block or
two.
We were watching a movie about an evil conglomerate when the Big
Boss's plans were revealed in a Giant Screen Reveal as he
spoke them without realizing they were being
broadcast.