The Hitchhiker’s Guide To The Galaxy – Douglas Adams has a delightful sense of humor and uses the most amusing metaphors.
Surely You’re Joking, Mr. Feynman! – Richard Feynman is a delightful shining star of what a high-functioning, highly-accomplished, loved and respected ENTP is like.
The 48 Laws of Power – this one is particularly good not because it’ll turn you into some sort of amoral Machiavellian power player, but because it’ll reveal to you how some of your behaviors (thought you might’ve thought of as charming quirks) are actually abrasive and hurtful to others, and ultimately lead to suboptimal outcomes for you.
How To Win Friends And Influence People – There’s really no point losing friends and influence just because of the way you operate.
Getting Things Done: The Art of Stress-Free Productivity. If you haven’t read it, just go through it. I have some notes here.