Given the fact that most bubbles blown with your mouth are no more than about 6 inches across... the fact that they can blow bubbles like that with their asses... makes me marvel at their talent.. however I worry about the three dudes a bit...
I remember once I knew a guy who always swallowed his gum with no ill effects. Until he was watching TV one night and had one of those huge pails of Dubble Bubble on the coffee table. He'd keep chewing them until the flavour was gone and he would swallow them. He pretty well finished the pail, and was OK until he went to take a crap. Lets just say he didnt have fun getting the gum out of his hair.