The difference between stupidity and genius is that genius has its limits - A Einstein

The IQ of a mob is the IQ of its dumbest member divided by the number of mobsters. - Terry Pratchett

Laws

• Always and inevitably everyone underestimates the number of stupid individuals in circulation.
• The probability that a certain person be stupid is independent of any other characteristic of that person.
• A stupid person is a person who causes losses to another person or to a group of persons while himself deriving no gain and even possibly incurring losses.
• Non-stupid people always underestimate the damaging power of stupid individuals. In particular non-stupid people constantly forget that at all times and places and under any circumstances to deal and/or associate with stupid people always turns out to be a costly mistake.
• A stupid person is the most dangerous type of person.
• A stupid person is more dangerous than a bandit.