Re: Fav moment
A moment that would have been far more effective had it been a genuine revelation, like the 'dark water' reveal. They did a great job of forshadowing, laying just enough hints for people to speculate, right up until the end of the previous episode - when they gave everything away by showing cybermen in the post-episode teaser.
There's no fun in spotting the cyberman symbol if you already know there will be cybermen along before the episode is over!