Not sure whether it was the drugs or a dream, but I have some memory of me becoming slightly conscious during eye surgery a few years ago. I felt a lot of pressure to the point it was painful, and I told the doctor something along the lines of "I can feel that" after I couldn't take it anymore. Next thing I know, I blacked out again and don't remember anything else until I was being wheeled into the recovery room feeling terribly nauseated. The procedure was simple and they used local anesthesia to correct what remained of my strabismus, but boy did it scare me enough to avoid willingly going under the knife again.