A comedy is entertainment consisting of jokes intended to make an audience laugh. For ancient Greeks and Romans a comedy was a stage-play with a happy ending. In the Middle Ages, the term expanded to include narrative poems with happy endings and a lighter tone. In this sense Dante used the term in the title of his poem, the Divine Comedy. The phenomena connected with laughter and that which provokes it has been carefully investigated by psychologists and agreed upon the predominating characteristics are incongruity or contrast in the object, and shock or emotional seizure on the part of the subject. It has also been held that the feeling of superiority is an essential factor: thus Thomas Hobbes speaks of laughter as a "sudden glory." Modern investigators have paid much attention to the origin both of laughter and of smiling, as well as the development of the "play instinct" and its emotional expression. M... This channel was generated automatically by YouTube's video discovery system.