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Another well known example of spontaneous intuitive insights are jokes. In the split second where you understand a joke you experience a moment of ‘enlightenment’. It is well known that this moment must come spontaneously, that it cannot be achieved by ‘explaining’ the joke, i.e. by intellectual analysis. Only with a sudden intuitive insight into the nature of the joke do we experience the liberating laughter the joke is meant to produce. 

Excerpted from Page 37 of ‘The Tao of Physics’ by Fritjof Capra