anesthesia
"I would rate propofol 8/10 because I had a very intense burning that traveled up my arm for 20-30 seconds during administration. It seems this can be avoided by administering lidocaine first, which not all anesthesiologists do.

Burning aside, I couldn't have had a better experience with sedation as I did not experience any side effects, was fairly functional the rest of the day (did sleep a fair bit), and did not remember any of the procedure."