This woman rushes to see her doctor, looking very much worried and all strung out. She rattles off, "Doctor, take a look at me. When I woke up this morning, I looked at myself in the mirror and saw my hair all wiry and frazzled up, my skin was all wrinkled and pasty, my eyes were blood-shot and bugging out, and I had this corpse-like look on my face! What's wrong with me, Doctor?"
The doctor looks her over for a couple of minutes, then calmly says, "Well, I can tell you that there ain't nothing wrong with your eyesight."