This is the one I posted. I haven't watched the Derren Brown one yet but am looking forward to it.
What I liked about this one "Curiosity" is that the scientists used different techniques to insure that the subject was truly hypnotized and not just either playing along or going along with it as a form of social pressure. They found that some could be hypnotized to deeper degrees while others could not.
There were 2 final tests. One test had the subjects go into a restaurant and as soon as they sat down, they believed their seat made them so hot that they had to take their clothes off. As soon as their clothes were off, they would go even deeper into a trance at the table until the hypnotist waked them. As this was done, they studied their reactions to see if they looked like they questioned the command in any way, or hesitated. If so, they were eliminated.
The final test had the last four sit into a tub of ice water held at 35 degrees F. 2 degrees above freezing, while thy were told that the water was warm and comfortable. The subjects were hooked up so that their vitals could be monitored and they were not to sit in the water for over 2 minutes as hypothermia would start to set in, or their heart could start palpitating.
It was so cold that the hypnotic suggestion was not enough for 3 of the subjects. Their vitals proved their brain was reacting to the extreme cold.
The 4th, however, vitals maintained which proved his brain was over-riding the signals being sent to it. His heart rate only slightly elevated "involuntarily" and he stayed in the entire 2 minutes until they pulled him out - he could have stayed longer "mentally".