In theatre (especially in the illusionistic Western tradition), breaking character occurs when an actor ceases to maintain the illusion that they are the character they are supposedly portraying. This is considered unprofessional while performing in front of an audience or camera (except when the act is a deliberate breaking of the fourth wall). One of the most common ways of breaking character is corpsing, in which an actor loses their composure and laughs or giggles in a comedy scene or scene requiring ludicrous actions. If the breaking of character is particularly serious, it would normally result in an abandonment of a take in recorded or filmed drama.

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The advent of DVD players, with the use of their precise pause and slow-motion functions, has made it far easier to spot breaks in character in motion pictures, and many internet sites collect such examples.^[1]

Example:

• Catherine Schell, who found it difficult to act with Peter Sellers in The Return of the Pink Panther and maintain her composure. Several scenes showing her laughing at his antics remain in the film.^[2][3]

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Examples of actors breaking character on television include:

• Lucille Ball, in a rare example of breaking character for her, was forced to break character during filming of "Lucy and Viv Put in a Shower", a season 1 episode of The Lucy Show. In the climactic scene, the titular shower filled with water due to a drain malfunction, and Ball nearly drowned attempting to unplug it. Co-star Vivian Vance hastily reworked the script to allow Ball to recover her composure.^[4] Ball's near-drowning was included in the finished episode, which was one of several from the series to lapse into the public domain.

• Many instances of breaking character have occurred on Saturday Night Live, and showrunner Lorne Michaels is known to enjoy character breaks:
  • Christina Applegate and David Spade could not stop laughing at Chris Farley's motivational speaker character, Matt Foley. ^[5]
  • The band members in the "More Cowbell" sketch broke character reacting to Will Ferrell's antics. Jimmy Fallon often broke character, which became one of his trademarks.^[6][7][8]
• In the Doctor Who episode "The Feast of Steven", actor William Hartnell breaks character to wish the audience a merry Christmas, with actors Peter Purves and Jean Marsh also breaking character, erupting in laughter. The Christmas address was scripted, but the laughter was not.^{[Note 1]} In episode 5 of the Doctor Who story Frontier in Space, there is a scene in which the Master (Roger Delgado) leads captive Jo Grant (Katy Manning) through a rocky terrain. Despite his typically soulless nature, the Master audibly tells Jo to "be careful down here" – an out-of-character statement from Delgado to aid Manning, who is very nearsighted.
• On The Daily Show, Jon Stewart or one of the correspondents occasionally broke character during a segment. One example was a piece on an allegation of a homosexual relationship involving the then Prince Charles and the British tabloids' shameless use of innuendo and euphemisms to spread the rumor while avoiding libelous statements. The segment had Stephen Colbert "reporting" from Britain and explaining, in terms laden with homoerotic imagery, that it would be journalistically irresponsible to go into detail about the story. He then peeled a banana and took a huge bite of it in imitation of fellatio, causing himself to smile and Stewart to begin giggling off screen. By the end of the segment, Colbert was laughing so hard he could barely speak.^[9]
• While playing NewsNation host Bobbi Moore in a April 13, 2024 SNL skit, Heidi Gardner, who has built a reputation for maintaining composure during comedy scenes, drew considerable attention for corpsing in what Vulture magazine characterized "in spectacularly charming fashion".^{[10][11][12][13][14][15][16]}

Breaking character or corpsing is also being used more frequently to describe a participant-player who, having assumed the role of a virtual character or avatar and is acting within a virtual or gaming environment, then breaks out of that character.^[17] For example, this could be a player-character behaving inappropriately within the social-cultural environment depicted by the virtual or gaming environment or the participant-player ceasing to interact-play (momentarily or entirely) leaving the character suspended and/or lifeless.

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Breaking character is not solely limited to performances in traditional theater, television, and film; the phenomenon is not unheard of in professional wrestling, which is normally highly scripted.

In Ruggero Leoncavallo's opera Pagliacci, commedia dell'arte actor Canio kills his real-life wife and her lover onstage.

• Out of character communication in the sociological theory of dramaturgy