Mr McKenna had denied negligence and said Mr Gates' illness was not caused by being hypnotised.

BBC: Hypnotist cleared

The script, he added, saw Homer Simpson hypnotised into thinking he was 10.

BBC: Simpsons to shoot Judd Apatow script at last

One study showed patients could put their hands into boiling hot water without registering pain after being hypnotised, when they had earlier experienced intense pain.

BBC: Hypnotherapy session

And you won't act out of character while you're hypnotised.

BBC: Hypnotherapy session