Lately I've been trying to explain to people that the Category Error they make is that we have memorized our own code, but when we look at the code of others it all has to fit into working memory. It's very hard to anticipate how other people will see your code.

One of the advantages of mentoring people is that you can run User Studies whenever you want. Tell them what the code is for and what you want them to do, and then watch them try to figure it out themselves, see how far they can get before you have to stop the experiment (due to them getting frustrated).