  In this work we analyze an evolutionary game that incorporates the ideas
presented by Cipolla in his work \textit{The fundamental laws of human
stupidity}. The game considers four strategies, three of them are inherent to
the player behavior and can evolve via an imitation dynamics, while the fourth
one is associated to an eventual behavior that can be adopted by any player at
any time with certain probability. This fourth strategy corresponds to what
Cipolla calls a stupid person. The probability of behaving stupidly acts as a
parameter that induces a phase transition in the steady the distribution of
strategies among the population.
