I believe in probability. I don’t play Powerball because I have about as much chance of winning as drowning in a bucket. However, eerie coincidences tend to follow me around like stray puppies. I don’t notice them until I look over my shoulder, and there they are, tails wagging and tongues panting, and a little too close for comfort. When I was 24, I noticed the registration number on my birth certificate: 123456. It was creepy then, but even eerier now that it’s the most popular computer password—and a sucky one at that. This eerie coincidence involving Great Grandmother’s Gingerbread (Over 100 Years Old) began in 1976, when I bought an old textbook, Domestic…