On first reading this, my first though was "you'll be grand". On reading when it was posted though, & the lack of an appearence since, I'm not so sure....
I've been under a few times, & I agree that it is quite an ok experience, really, even if the first time I had a general I was really ill as I came round - I now have to let the anaesthetists know that I get sick on it! A little bizarre too when on one occasion they didn't give me enough anaesthetic & I woke up before they could get me to recovery - I still had the tube down my throat, not a nice feeling! Two weeks later when I went under again they had this in mind, obviously, as I didn't wake up till the next morning!
I think it was Griffin mentioned gas & air - fantastic stuff!! When I broke my femur I had gas & air on top of a morphine jab - Jesus, I didn't know a thing, felt like I was flying 6 feet in the air!!