@goatsarah Teeth are the example I normally think of, though knees are good too. What's even going on with teeth?
The mess that is hunan knees is easy to explain evolutionary though. We spend like a couple hundred million years evolving knees optimized to walk on four legs, and just 'recently' start using them *wrong*? (Apparently using hands for tools is beneficial or something.) Maybe evolution would eventually fix that, but give it at least a few more million years.