Well, that's a funny story actually.
I had ear surgery when I was 5, they used propofol. I was under within a couple of seconds but I woke up maniacally. I don't remember any of it, but I bit a nurse's ear off, apparently.
The next time was when I was 17, having my wisdom teeth extracted. I had developed a deep fear of needles since then and warned the anesthesiologist. They used something else but it didn't work, so they went for an IV. It took 7 people to hold me down, I gave two guys black eyes and probably broke a guy's ribs before I was under.
Last time was a couple of months ago, on my bladder. Same story, they tried to put in an IV, but I was mildly sedated. I broke the anesthesiologist's arm and went under.
Side note: I was also national junior champion in Muay Thai, currently I'm into capoeira.
Edit: None of the violence towards the medical personnel was premeditated and I wasn't in a mental state where I was in control. Needles make the world go black for me, and when it does I tend to inflict a lot of damage to the person(s) trying to poke me with aforementioned needle.