The Dozens is a game played between two contestants in which the participants insult each other until one of them gives up. Common in African-American communities, the Dozens is almost exclusively played in front of an audience, who encourage the participants to reply with increasingly severe insults in order to heighten the tension and consequently make the contest more interesting to watch. Comments in the game may focus on the opposite player's intelligence, appearance, competency, social status, and financial situation. Disparaging remarks about the other player's family members are common, especially regarding their mother. Commentary is often related to sexual issues, and this version of the game is referred to as the "Dirty Dozens". According to sociologist Harry Lefever and journalist John Leland, the game is played almost entirely by African-Americans; other ethnic groups often fail to understand how to play the game and can take remarks in the Dozens seriously. Its popularity is higher among low-income and urban communities, but it is also found in middle-class and rural settings. Both men and women participate, but the game is more commonly played among men. Playing the Dozens is also known as "blazing", "roasting", "hiking", "capping", "clowning", "ranking", "ragging", "rekking", "crumming", "sounding", "checking", "joning", "woofing", "wolfing", “skinning”, "sigging", "scoring", "signifying" or "jiving", while the insults themselves are known as "snaps". The first academic treatment of the Dozens was made in 1939 by Yale-based psychologist and social theorist John Dollard, who described the importance of the game among African-American men, and how it is generally played. Dollard's description is considered pioneering and accurate. Dollard originally wrote that he was unaware of how the term "Dozens" developed, although he suggested a popular twelve-part rhyme may have been the reason for its name. He only speculated on how the game itself grew to such prominence. Other authors following Dollard have added their theories.