There is no upper bound on the amount of stupidity that can exist within any particular individual.
We always underestimate the number of stupid individuals in circulation.
The probability of a person being 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, without any advantage accruing to himself- even possibly incurring losses of his own.
Non-stupid people always underestimate the damaging power of stupid individuals. They constantly forget that at any moment and under any circumstances to deal and/or associate with stupid people invariably constitutes a costly mistake.
A stupid person is the most dangerous person in existence.
from The Power of Stupidity by Giancarlo Livraghi