People who laugh together are more likely to link and bond. And, while the causes of laughter vary greatly between individuals and communities, the sound of a laugh is generally familiar to people from various cultures.

Human laughter is believed to have arisen during play, a theory reinforced by multiple primate primates' play-related panting laughter. Human laughter may have originated from a related panting tone that "became ritualized into the vocalized 'ha ha ha' that we use today," according to Winkler. According to the researchers, people continue to laugh while playing. However, we still inject humor into vocabulary and non-play activities, using laughter in various ways to express a spectrum of feelings, both positive and negative.

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