"Why is Cloud 9 so amazing? What is wrong with Cloud 8? That joke came off the top of my head, and the top of my head ain't funny!"

Mitch Hedberg is making a joke about the distinction between Cloud 9 and Cloud 8. He is suggesting that there is nothing wrong with Cloud 8, however Cloud 9 is so fantastic that it is nearly amazing. He is also suggesting that his joke was not amusing, however he created it on the spot. This quote is an amusing way of revealing the concept that often the best ideas come from spontaneous thinking. It also recommends that even if something is not funny, it can still be appreciated for its creativity.