Why is it that you can give a perfectly normal, sane person a teaching degree, and they think they're omniscient?

Why is it that a person's most glaringly idiotic attributes show the strongest when they are convinced that they're infallible?

And incidentally, why is it that the Scooby Doo gang never learn from past episodes? And I'm sure that the patent for that van that runs on water should have been snapped up by an oil company long ago.

Ah, my precious religion class was snatched from my grasp today by the afore-mentioned arrogant person with a teaching degree. Who then proceeded to work herself into a fit of emotion in exasperation at something, the exact nature of which I'm not exactly sure. Whatever the cause, she seemed quite narky by the end of a 2 hour period... sorry about all my useless moaning, Everything-viewers.
Must write today. Otherwise I'll never get it done.