The Riddle of 11 Plus Two Equals One

With 11 plus two equals one, what does nine plus five equal? Does it equal two? I'm sure that's the wrong answer. Well, clearly that equals eight, but I can't tell you why. Look down upon your hands. That is where the answer stands. This is how fingernails do math. No, no, no, you silly bitch,. It's just counting. So you just count with your fingers. Work your way around it. Yes. The other part of the rhyme was "I don't understand" But he cut me off at some point. There goes the clock.