It reminds me many times of my students attempt to cover their errors with the excuse "well I didn't MEAN to make the mistake". That's likely true; very few people mean to make a mistake (otherwise it wouldn't be a mistake) but the question never becomes why the mistake was made, but what you're going to do about it. You can sit around and bleed, or you can drive yourself to the doctor, fix it up, and jump back in the game without missing a beat.
Unless it's a concussion. Those are bad apparently. I learned that yesterday too. From the movie Concussion.