Late one day a local pub saw six guys walk in, obviously in pairs of two, sit down and order their favorite after-work drinks.
The first two to seat themselves and be served by the bartender were two guys working at a major university whose I.Q.s were so high they could hardly be measured! They began discussing Quantum Mechanics and the fine points of Particle Physics, either one as brilliantly as the other.
The bartender then went over to the next pair who were "regular guys" with ordinary jobs, with average I.Q.s, schmoozing about how hard it was today to keep up with bill payments, how high taxes were, how corrupt politicians were and all the day-to-day struggles most everyone has.
The last two the bartender served were two very badly educated, ill-mannered dolts with very low I.Q.s that could barely be measured on any I.Q. test. As soon as they'd ordered, the bartender overheard one say to the other, "Hey, man, I meant to ask ya, d'you use flatwounds or roundwounds on your bass?"