anesthesia
"Five years ago, for my last colonoscopy the nurse gave me a Versed cocktail, which put me under for about 10 seconds, then I woke up and literally felt no effects from the medicine.  The doctor then began the procedure and I was in such pain from the cramping that the nurse gave me a second dose of Versed, which I still powered through.  The effect was like being very drunk and thinking through molasses, but I was awake the whole time and able to watch the entire procedure on the television, mostly annoyed that it was so hard to concentrate.  

This time, I received 260mg of propofol, within 10 seconds my head felt numb and then I was out cold.  In what seemed like the next instant I was dreaming and then opened my eyes in the recovery room."