I knew a deck officer once who had the worst halitosis and never seemed to notice. He would come up and speak earnestly right in your face--I think he was nearsighted as well. Anyway I had asked him several times not to do this, and he persisted. So one time I just nodded vigorously, which brought the hard bill of my officer's cap square down across the bridge of his nose. The pain was sufficient to lay the lesson in permanently.

But that isn't psychology, except in the crudest sense fo the word.