A bizarre video has emerged of a man allowing two snakes to burst balloons held in his mouth. The footage, shot in Jacundá, Brazil, on Wednesday, shows Arteval Duarte - a snake handler known as the 'Ninja of Serpents' - holding the yellow balloons in his mouth and presenting them to the boas for them to burst. Duarte explained online that he trained the boa constrictors to obey his command to burst the balloons. The performer claims he does these shows in order to raise awareness about the destruction of the Amazonian rain forest.