An ELL post says
This is not some science fiction movie come to life.
I am confused by this sentence.
"is" implies that an unexpected event happened, such as a robot with high intelligence has been made. The event is individual, so it's singular. I understand this part.
"some" with countable nouns usually indicates a few of something in plural form. However, that sentence uses a singular form "movie". I cannot understand this part.
Could someone please give a hint?
Maybe you need a bit of more context there.
I think that the original poster may have taken that excerpt from this tweet quoting the declarations of an American polititian
"This is not ebola, this is not SARS, this is not some science fiction movie come to life. The hysteria here is way out of line with the actuality and the facts"
This in your sentence does not represent a robot nor any sci-fi topic, the polititan is talking about the actual global coronavirus crisis. This crisis is not a (science-) fiction story, it's very real.
In this context the word some means, according to the Oxford Dictionary
Used to refer to someone or something that is unknown or unspecified
It's not a (unspecified) science-fiction movie what we're living right now. He's not comparing our situation with a specific movie because it's not relevant at all for the rest of his declaration.
You can check more examples of that use of some in the linked reference.
