I have had several surgeries with everything from a light to general anesthetic. I warn the nurses and doctor beforehand that I have a history of waking and remember previous operations. Most do not believe me. I remember the sound of my wisdom teeth being cracked open and opening my eyes while they were being cut out. I remember scaring the shit out of a nurse and doctor when I woke and started talking mid-procedure. I remember being held down when I kept trying to roll onto my side as if I were asleep. Typically, the reaction is something like "he is awake" followed by a flurry of action, then sleep. I don't know why this happens-- I suspect something makes the anesthesia wear off faster than normal. I also have an issue at the dentist with numbing-- they usually have to hit me twice. If that doesn't work fully, I just tell him to go ahead and I will deal with it.
I also had this happen. Literally almost the exact same, don't remember whether I opened my eyes or not but I remember hearing crunching sounds coming from my mouth and realizing it was them drilling or hammering or doing something destructive to my wisdom teeth. But zero pain. Just a wtf that is weird af feeling. But then I passed back out (not sure if they did something to make me fall back asleep or if it occurred of its own accord).
