I don’t remember the show (or even if it was a show) but a guy went to the doctor to complain about his back pain. Doctor said that it might clear up in several thousand years. Confused, the patient asks for clarification. Basically, humans went bipedal too soon, and our spines weren’t made to be upright for so long at a time. The doctor’s analogy was that we “turned a clothesline into a flagpole”.