The scenes which always floor me are the ones which make me sympathize for fictitious people. Negative emotions especially, where I hate a cruel character, and pity his victims, and regret the decisions they have made which I, the omniscient reader, know will turn out badly; these drive me up the wall in the best way. And it's like, how can you know a story is completely made-up and fake but still invest emotions in it anyway, you know? But that's the hallmark of great fiction. You care despite knowing, on some objective level, that it's a waste of emotional energy feeling sorry for people whose lives and whose pain aren't even real, because these fake people and fake events feel just as human as you are.