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As a software engineer who started programming when he was 11, I get what you mean about “ladder climbers” feeling alien (my elitist term for them is “9-to-5ers” or “pedestrians”).
However, I think this question is dumb at least so far as it won’t work to weed out the people you think it will. I don’t read fiction often, and the only scifi books I remember reading are Dune and Prey, but that’s very out of character for me. It’s pretty much luck that I read those, and more a factor of me just being an old fart (I’m almost 30, and that’s a lot of time to stumble upon at least one scifi book). Ask me this question a few years earlier and I’d draw a blank.
Both were good books, but nothing that would consider a “favorite”. Dune is memorable to me just because it very clearly was based on Lawrence of Arabia, which I found neat. As for Prey, I only vaguely remember something about killer nanomachines, and that it was a fun read.
But if you’re specifically looking to hire someone you can talk scifi novels with, then it’s a very good question (as long as you’re mature enough to hire someone who says their favorite book is one that you hate).
I think that’s just a common typo. The difference between '. ’ and ', ’ is hard to spot unless you have good eyesight, and they’re close together on the keyboard