pretty accurate >> People don't laugh at the same things. Does that mean they differ in smartness? Smart people laugh at the same things people that are not smart do if it is funny. If it's funny perceived smartness is irrelevant.
Because the smarter you are, the more you're aware of how little you really know. One of life's most important lessons is to take a moment before you speak, because what is very true for a lot of people is that the smarter you get the less you speak.