One of things that irks me and ruins more series than bad voice acting/general acting is having a deus ex machina at the end of it. It shows that the author had nothing better to do than end the story in a forced way, no struggle is met to over come the goal, it just happens. I can't possibly say how much this pisses me off.
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Everything's a dream!
Everything is actually a story that someone in the movie/show wrote!
I mean, a DeM pisses me as much as when they revive characters.
Harry Potter Spoiler:
If Dumbledore comes back from the dead I'll be fucking pissed.
But you probably knew about that one already.