From yoga teacher Sarah Miller's piece in The Awl today, "Why Yoga Can Be So Irritating":
There are teachers and students who think flexibility is some kind of indication of how good a person you are. A teacher once said to me, "Your hamstrings are tight is because your mind is not flexible." I said, "Have you ever taken differential calculus?" She said, "What?" I said, "Have you ever taken differential calculus?" She had not. She said she was terrible at math. I said, "Well, I am very good at math." (This was not strictly true, but I was quite confident I was better at math than she was.) “Is there something wrong with your mind that you aren’t?”
This was obviously written for nerds everywhere. You shall know the differential calculus, and the differential calculus shall set you free.