So in case you don't get the whole joke in the argument about Kargob's eyes, this is the explanation:
Kargob has four eyes, and he wears a pair of glasses. "Four Eyes" is an insult given towards people who wear glasses. The joke is that the people are unknowingly insulting Kargob by arguing over if he has "six eyes" or "eight eyes", because he wears a pair of glasses over two of his eyes.
With that in mind, it's debatable whether Kargob uses his glasses for only his two lower eyes (which would mean that he's half blind and has "six eyes") or all four (which would mean that he's entirely blind and has "eight eyes").
