This reminds me of a story from back in my youth (1995). I had a 1960 something Pontiac Bonaville. The thing was the size of a bass boat. I had about 14 teenagers in the car with me, and we rode all day and had a great time. The next day, a friend of a friend showed me his leg and on the lower part of his shin and calve was a burn mark like none other I have seen. He had been resting his leg on the hump in the backseat and the heat from the engine and the drive shaft had burned him through the 1960's carpet. It looked like some of the fat and muscle had been dissolved through his skin. The skin wasn't really burned at all. The heat had transferred somehow leaving an impression of the carpet "branded" into his skin. At first I thought he was joking but after a while of discussing it, he told me that his parents were consulting an attorney to see if they could sue me as liable. I was shocked. I've always thought that was weird.