While Firaxis' Jake Solomon and I were talking about the addition of The Second Wave to XCOM: Enemy Unknown, our conversation shifted to the game's poorly-received first paid DLC, Slingshot. From there, he also reflected on players' response to XCOM's difficulty and how 2012 was a banner year for "consequence" as a concept in video games.
People make maps in Team Fortress 2 specifically for grinding achievements. Bleak, joyless rooms of endlessly spawning bots and resupply crates, where people don't play the game, they game it. But in one of these, achievement_all_v4, the author's added a surprise. A violent, horrific, hilarious surprise of biblical proportions. Here's a clip.