Actually, I'm not even sure I did, but I remember doing it. The doctors never told me anything about it.
I remember waking up and seeing something covering my eye, and moving my hands to do thumb ups and peace signs (I knew there were students in the room watching the surgery), and then I remember hands trying to immobilize me, and me trying to start thumb wars, then blacking out.
I don't remember pain, just that it was fun to fuck around with them.
Contrast that to my first eye surgery, for which I was completely awake, and the local anaesthesia wore off. That was hell. Excruciating pain while the doc had various instruments in my eye. I voluntarily stopped breathing as I clenched against the pain. Set off all sorts of monitors. The whole stress of it and the swelling in the eye had me blind in that eye for nearly 3 weeks. First week was total blackness. Slowly started fading back in as the swelling went down. Very disconcerting.
Second eye surgery, made clear what happened and the doctor was far more liberal with the anaesthetic both before amd during surgery and I had no pain and minimal swelling and near perfect vision immediately out of the OR.
The asshole anesthetist denied it happened.