Poll: Diabolus Ex Machina

The 'negative' counterpart to the more famous Deus ex Machina, the expression refers to last-minute intrusions of objects, events, characters, powers or other plot 'contrivances' causing a shocking yet memorable downer ending. Which of these Diaboli Ex Machina surprised you the most (in a shocking, sad or even pleasant) way? After voting, you may discuss the list here