I was sitting in the Dentist chair the other day (its an electric job with all the power options) and also had a similar experience.
I love my dentist, couldn't be a greater guy, he likes country western music, so that is what us patients listen to.
But I swear what I heard... a soft whispering voice over those audio speakers telling me... "mama tried to steer me right, but it did no good, and since I turned 21 in prison doing life without parole... I deserved whatever was going to come down the pike while sitting in this here chair..." And when it came time to take the X-rays, they laid that heavy lead vest on me... I knew that they had me where they wanted me and there was no use trying to escape.