I can't believe this one hasn't been said yet, so I'll do it:

"I don't think I know everything, I KNOW that I know everything"

Indeed.

I'm pretty sure he was referring to this:

"I'll reach 550 posts before September 21th."

September 21st, right

people who think they know everything, know nothing

That is simply because you think you know everything and not him. Else, you'd be getting those A's, eh?

This is the internet. I am right and you're wrong. Now, shut up and accept that fact.

The misconception concerning omniscience stems from elitism, most frequently. Or put another way, people think they know everything because they count themselves amongst a "select few". It's a convenient thing, really, elitism. It allows people who know nothing or almost nothing about a given subject to feel smugly superior to others even when they're being looked down upon by everybody else for their deliberate ignorance.

The surest sign of elitist ignorance is when somebody claims they are right and refuses to discuss it. Other marks of the trait are relying on personal attacks in debates, tossing about labels with wild abandon, declaring any source of contradictory information presented as unreliable, and just generally acting like a jerk about something to avoid having to admit a lack of knowledge.

Some even try to mask their lack of actual knowledge with long-winded diatribes of poorly used statistics, but don't be fooled. I find that, the angrier a person gets at your continued opposition to their opinion, the less they actually know about the subject.

Now that's interesting. It seems that I have been misusing the term "elitism". A curious little tidbit from the Wikipedia entry on it:

"The term elitism is also sometimes misused to denote situations in which a group of people claiming to possess high abilities or simply an in-group or cadre grant themselves extra privileges at the expense of others. This debased form of elitism may be described as discrimination."

So in actuality, people pretending to be above others with nothing to back it up are just being discriminatory. That makes quite a bit more sense.

I was born to be correct...

because I do know everything....