This Japanese Human Relations calculator can tell you your compatibility with another person by simply inputting your birthdays. It's sure to save you many headaches.
It can also tell your fortune, if you're living life solo these days. I'm assuming both solo and couple fortunes are pulled out of thin air and are wildly inaccurate and/or vague, but hey, maybe it's actually a magic calculator that can learn about the various nuances of your personality based solely on your birthday and the fact that you'd buy such a stupid calculator. Anything is possible. [Amazon.jp via Technabob]