Ever wondered how some people can laugh so easily while others take a while to even smile? Laughter clubs around the country have so many participating making one think that this can be achieved due to sheer practice. What does the study say? If your wife immediately bursts into laughter after a humorous moment while you barely manage to crack a smile this could be due to her genes new research says. The researchers demonstrated that people with a certain genetic variant smiled or laughed more while watching cartoons or subtly amusing film clips than others. Which gene in particular?