This paper argues that the new science of positive psychology is founded on a whole series of fallacious arguments; these involve circular reasoning, tautology, failure to clearly define or properly apply terms, the identification of causal relations where none exist, and unjustified generalisation. Instead of demonstrating that positive attitudes explain achievement, success, well-being and happiness, positive psychology merely associates mental health with a particular personality type: a cheerful, outgoing, goal-driven, status-seeking extravert.