Ever wake up with slight discomfort in your neck? You tell yourself "it's fine" and "it'll go away." Then you go about your business.
You pour yourself some cereal and watch a little morning news before you hop in your car to go to work.
Everything seems just dandy until you turn to look in your rear-view mirror, and then.....
...and then you feel a sharp pain attack your neck like an angry pug.
This happened to me recently and the end result was that I had to walk around for two days unable to look at anyone without twisting my entire body.
Photo credit: Wuertele