The most useful thing that comes naturally to me is directions. I can’t just give directions, but if you have me with you, you will never get lost. Or if you do get lost, it was your own damn fault, and I will happily get you un-lost very quickly. I just have this preternatural sense of direction, even in places I’ve never been before. My dad is exactly the same way. Neither of us has any idea how it works; it just does.
My skill with anagrams tends to impress people. Not really useful, but still a lot of fun. In the same sort of vein, I can’t recall ever meeting a logic puzzle I couldn’t solve. Often I really can’t explain to anyone else how I got the answers because my mind just zips around while I’m doing them and if I slow down I wind up confused. And I’m also a bit quicker than most people when it comes to sudoku, because I’m a synaesthete and numbers have color for me, which gives me a little advantage.
Actually, now that I’m thinking about it, the most useful thing that comes naturally to me is probably, um… using semantics to my advantage. That, combined with just a little diplomacy has made people comment that I can tell someone to go to hell in a way that makes them look forward to the trip.
Also, I’m really modest and humble.