I remember the first time my back went out on me. It was when I was working for the toy company here in Booneville, covering the annual downtown event. I had to move a large number of large boxes of toys, and finally - there it went. I managed to get home, fell over on the bed, and just lay there trying not to move so it would not hurt quite as badly.
Before that time I had scoffed at people who complained about bad backs, figuring they were just using that as an excuse. I got cured of that opinion in a hurry.