The rules of humour are analogous to those of poetry. These common rules are mainly timing, precision, synthesis, and rhythm. French philosopher Henri Bergson has said in an essay: "In every wit there is something of a poet." In this essay Bergson views the essence of humour as the encrustation of the mechanical upon the living. He used as an instance a book by an English humorist, in which an elderly woman who desired a reputation as a philanthropist provided "homes within easy hail of her mansion for the conversion of atheists who have been specially manufactured for her, so to speak, and for a number of honest folk who have been made into drunkards so that she may cure them of their failing, etc." This idea seems funny because a genuine impulse of charity as a living, vital impulse has become encrusted by a mechanical conception of how it should manifest itself.
Precision
To reach precision, the comedian must choose the words in order to provide a vivid, in-focus image, and to avoid being generic as to confuse the audience, and provide no laughter. To properly arrange the words in the sentence is also crucial to get precision. An example by Woody Allen (from Side Effects, "A Giant Step for Mankind" story ):
“ Grasping the mouse firmly by the tail, I snapped it like a small whip, and the morsel of cheese came loose. ”
