Actually the starter fluid method is painless, just puts you to sleep it was used for surgery in years past and I almost lost a driver to it years ago. In the winter we often throw our cans in the cab with us to have it handy and one of my drivers had tossed his under the seat. Seems it landed upright and every time he hit a bump the air-ride seat came down and shot a little out. Said he thought he smelled it but then it went away so he didn't worry about it, he was just getting used to the smell. Well after about 50 miles he said he got tired and could hardly hold his eyes open so he got out and walked around. Well the fresh air revived him and he said this went on for close to two hundred miles and the last time he decided to do a walk around and got his flashlight from under the seat and that is when he found the can. Now Bob was about 6'6" or so and weighed around 350lbs and that little can of Ether almost got him.