This man said that he fell on top of a doorknob
You cannot cover the sun with your thumb. Sometimes, no matter how hard you try to lie to yourself and the rest of the world, the facts always tell the truth. You might feel embarrassed to open up about your life with total strangers, but it is way more awkward if they catch up with your lie.
This man insisted that he fell on top of the doorknob while putting his shoes on, but the chances of this actually happening are low, not to say that it is actually impossible. In reality, he did not want to tell the doctors what he was doing, but they knew right away.