Children prepare to take part in a Guinness World Records attempt for "the most people playing a hand clapping game simultaneously" in Buftea, Romania, on June 16, 2018. (Xinhua/Cristian Cristel)

Children take part in a Guinness World Records attempt for "the most people playing a hand clapping game simultaneously" in Buftea, Romania, on June 16, 2018. (Xinhua/Cristian Cristel)

A child takes part in a Guinness World Records attempt for "the most people playing a hand clapping game simultaneously" in Buftea, Romania, on June 16, 2018. (Xinhua/Cristian Cristel)

People take part in a Guinness World Records attempt for "the most people playing a hand clapping game simultaneously" in Buftea, Romania, on June 16, 2018. (Xinhua/Cristian Cristel)

A Guinness World Records judge presents the certificate of a record for "the most people playing a hand clapping game simultaneously" in Buftea, Romania, on June 16, 2018. (Xinhua/Cristian Cristel)