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A blooper, or gag reel, is short clip from a film or video production, usually a deleted scene, containing a mistake made by a member of the cast or crew. It also refers to an error made during a live radio or TV broadcast or news report, usually in terms of misspoken words or technical errors.

The word blooper comes from the early days of radio, from around 1926. Used in baseball by 1940, it meant "hit a ball in a high arc over the head of a fielder". It has been used as a noun from 1931.

The term blooper was popularized in the 1950s and 1960s in a series of record albums produced by Kermit Schafer entitled Pardon My Blooper, in which the definition of a blooper is thus given by the record series' narrator: "Unintended indiscretions before microphone and camera."

Bloopers are often the subject of television programs and may be shown during the closing credits of comedic films or TV episodes. Prominent examples of films with bloopers include The Cannonball Run, Cheaper by the Dozen, and Rush Hour. Jackie Chan and Burt Reynolds are both famous for including such reels with the closing credits of their movies.

In recent years, many animated films have also incorporated bloopers, including a mix of faked bloopers, genuine voice-actor mistakes set to animation, and technical errors. Examples can be found in A Bug's Life (1998), Toy Story 2 (1999), and Monsters, Inc. (2001). Humorous mistakes made by athletes are often referred to as bloopers as well, particularly in baseball. Though sometimes the more provocative choke term may used to describe such plays instead, especially if a blooper ends up effecting an outcome of a sports competition in a major way such as a late-game event in a close game. This is especially true if the game was an important one in the outcome of a season such as a playoff game or championship event.