A joke is a display of humour in which words are used within a specific and well-defined narrative structure to make people laugh. It takes the form of a story, usually with dialogue, and ends in a punch line. It is in the punch line that the audience becomes aware that the story contains a second, conflicting meaning. This can be done using a pun or other word play such as irony, a logical incompatibility, nonsense or other means. Linguist Robert Hetzron offers the definition:

A good joke is succinct, containing no more detail than is needed to set the scene for the punchline at the end. In the case of riddle jokes or one-liners the setting is implicitly understood, leaving only the dialogue and punchline to be verbalized. Identified as one of the simple forms of oral literature by the Dutch linguist André Jolles, jokes are passed along anonymously. They are told in both private and public settings; a single person tells a joke to his friend in the natural flow of conversation, or a set of jokes is told to a group as part of scripted entertainment. Jokes are also passed along in written form or—more recently—through electronic messaging systems. Internet joking has indeed become a major method of transmission. Either as written narratives or graphic cartoons, jokes are sent through email to friends and acquaintances; individuals joking with each other in a physical space have been replaced here by electronic social groups. This correlates with the new understanding of the internet as an active folkloric space with evolving social and cultural forces and clearly identifiable performers and audiences. Along with individual transmission of jokes to email contacts, internet services are also available to provide a fresh joke-a-day to your email inbox or archive joke collections on electronic bulletin boards.

(source : wikipedia)

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