Callback (comedy)
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A callback, in terms of comedy, is a joke which refers to one previously told in the set. The second joke is often presented in a different context than the one which was used in the initial joke. Callbacks are usually used at or near the end of a set, as the aim is to create the biggest laugh at the end of a comic set. The main principle behind the callback is to make the audience feel a sense of familiarity with the subject matter, as well as with the comedian. It helps to create audience rapport. When the second joke is told, it induces a feeling similar to that of being told a personal or in-joke.
[edit] Television
In television, the term callback has come to mean a joke or line that refers to a previous episode. Particularly in earlier sitcoms - though even until the early 1990s - callbacks were rare and often frowned upon by networks, because they threaten to isolate a viewer who is new to the series, or who missed episodes. Seinfeld was one of the first sitcoms to regularly use callbacks in its scripts, although on a level which would often be missed or disregarded by viewers. More recently, Arrested Development has become well-known by fans for its regular use of callbacks throughout all of its episodes. Of course, the line between a callback and simple continuity can sometimes be ambiguous.