Daffy Duck Doesn't Need a Dungeon Master

On a scale, form 1 to 10, with 10 being the most intelligent and 1 being worse than useless, the difference between a 9 and a 10 is that a 9 knows everything and a 10 knows nothing.

Dumb people are over-confident in their abilities, and they never ask questions before doing something. Intellectuals not only have less confidence, but assume everyone thinks about things the way they do. And they ask how to do something the right way, instead of assuming they're doing it the right way. Obviously there's exceptions to every rule, but overall it's mostly true I'd say. (Having worked the last 25 years in Retail)