Probably had a heart attack at all the excitement.
It was much more physical than I thought it was going to be. The Cars are really striped down and you vibrate with the RPM, teeth and all. I did start to doubt my confidence after the car was started and the belts were tight, (real tight!) But I hit the gas and tailgated the spotter in front of me for 8 laps.
I'd do it again.
The heat inside is about 30-40 degrees higher than ambient. Maybe a stroke or something.