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Conan O'Brien in 2016. He is being sued by a writer who accuses him of stealing jokes. O'Brien says the idea of stealing someone else's comedy makes him physically ill. Tim Mosenfelder/Getty Images hide caption

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Tim Mosenfelder/Getty Images

Comedian Ari Shaffir performs at the 2015 Bonnaroo Music and Arts Festival in June in Manchester, Tenn. Shaffir has said fellow comedian Carlos Mencia stole his joke about who would build a fence on the U.S.-Mexican border. Copyright on jokes is difficult to prove, and it turned out two other comedians had made similar jokes as well. John Davisson/Invision/AP hide caption

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John Davisson/Invision/AP