Some people convince themselves that Lebron isn't that good, that the guy at the high school across town was almost as good. Or that they can hit a 90 mph fast ball. Or that they could take Mike Tyson. There are all these funny stories of guys wanting to fight Mike, race Michael Johnson etc. They really just can't see how far they are away from the really freakishly talented folks.

Folks like Jeff Dean at Google are really out there. He built a number of systems that very few people were capable of. But you have to be at a certain level to even see it.