This happend a few years ago and not sure if it was posted here:
http://www.competitionplus.com/drag-racing/news/15135-first-responder-to-nesbitt-car-i-had-no-idea-what-htranspired
Cliffs: Total driveline failure, driveshaft comes in car, almost rips her arm off.
Look at the pic, you can see part of the shaft to the left of the car and the force of the stuff entering the car bows the windows
Now she is suing
http://bangshift.com/blog/barbara-nesbitt-suing-nmca-nhra-skinny-kid-race-cars-and-others-in-conjunction-with-injuries-sustained-in-2010-incident.html
Cliffs: Someone screwed up, bad.
This is why a good, smart, well run track will enforce rules, to protect against litigation. This is also why it is better to not try and "run till you get booted" because you are one freak accident away from something very bad happening.