Q: What writing device or trick most irritates you when reading a book? For example, if an author employs an omnipotent narrator that is sometimes considered bad form.

I have several actually but I think the worst is the Deus ex Mechina. Especially when it doesn't even seem plausible or related to the characters/plot/anything in any way whatsoever.

Second on the list... Mary Sue / Gary Stu.  Sometimes the author does not realize they are doing this but when the READER picks up on it... it's bad.

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