Atlas Shrugged and/or The Fountainhead by Ayn Rand
The Alchemist by Paulo Coelho
Fight Club by Chuck Palahniuk
Infinite Jest by David Foster Wallace
A Little Life by Hanya Yanagihara
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Then, of course, there is the camp of people who believe certain popular, but not well-written books, are the marker of low intelligence and therefore should be avoided. Not to say these books cannot be enjoyed but maybe ditch the titles as your all-time favorite book.