What's inside the driver seat?
 

Ok this may be a really dumb question, but I've been wondering since I bought my car. When I press the back of my head firmly against the headrest, I can feel something poking me in my back. What is this thing? Is that supposed to happen?

It's to mitigate whiplash

http://www.the370z.com/nissan-370z-g...headrests.html

http://www.the370z.com/exterior-inte...ate-spine.html

http://www.the370z.com/nissan-370z-r...est-issue.html