Yes. I was in a fairly minor car accident, but got bad whiplash and felt/heard a pop in my neck. I thought I was fine, but an EMT watched the whole thing happen and told me not to move. I gotta say, props to the EMTs for being able to lift a person out of a sitting position without moving their spine, but man, the ambulance itself scared the crap out of me. Despite having a collar on, despite having the blocks next to my head, etc., I could feel the stretcher moving all over the place inside. If I had a serious neck or spine injury, the ambulance ride probably would have sealed the deal.
On the other hand, when they were asking me questions to see if I was really with it, I completely forgot what date it was (I think I managed to answer the year, lol), and when they asked me who the president was, I fumbled for the name and just said "some asshole." They must have thought I was a lot worse off than I was.