Cortana Moments/Gravemind Moments

Throughout Halo 3 there are moments where Cortana or Gravemind talk to you, sometimes the voices even merge together. When these happen all your movements are slowed down and if it's a Cortana moment her face will appear on the screen. If it's Gravemind talking to you you will somewhat pull away from the screen. Once the moment is over, a kind of computer data flashes over the screen. Some of these moments depict the beginnings of Cortana's rampancy.

Trivia

 * If you take a screenshot of a moment in theatre mode it will appear completely black in the scrapbook.