What do Pat Benatar, George Foreman, and I, your humble columnist, have in common? We were all born on the same day: Jan. 10! I only know this because someone gave me a 768-page book simply titled “The Portable Book of Birthdays.” Good thing, too, or I’d never have known that, according to the book’s authors, Pat, George, and I have socially savvy personalities and a keen ability to promote our ideas and to get what we want. We are intelligent and easily irritable, and need constant emotional stimulation. While the book doesn’t mention our favorite birthday cake, I feel confident in speaking for the three of us when I say that without a doubt it is coconut cake. But not just any coconut cake; it has to be three-day coconut cake, which is so delicious it will knock your socks off no matter when you were born. But first, …