Ahhh...propofol...midazolam...ketamine...
I've never had a (memorably) painful surgery, thanks to these (and other) drugs being appropriately dosed.
I can't imagine a more pleasant way to shuffle off this mortal coil. You just go to sleep and never wake up....
Midazolam won't induce unconsciousness in small amounts. Propofol will. It has a steep dose/response curve so a couple of gallons would do you in.:-)