My former business partner, a very sober, nondrinking, nosmoking family man, once told me that he knew a person in college who coud fly under his own power. For years I tried to get him to admit he was pulling my leg or joking, but he always assured me most solemnly that he himself had seen this person fly without the use of technology of any kind on more than one occasion. To this day he maintains that the story is true. I'm inclined to believe him.
That's really hard to believe. But, it's hard to flat out say to a person you've known and trusted all your life "you're a liar."