A small boy was playing with a balloon around the house, flicking it in the air with his hand. His mother told him to stop in case he broke an ornament, but he paid no attention. Finally after incessant nagging, he stopped. "Right," she said, "I'm just going to the shop for some groceries. I'll only be twenty minutes, so I want you to stay here and behave yourself." As soon as she was gone, he started playing with the balloon again, flicking it from room to room until, to his dismay, it landed in the toilet bowl. He left it there and went off to play with something else. Shortly afterwards his mother returned home in a state of high anxiety. Hurriedly dumping the groceries in the kitchen, she ran to the toilet and proceeded to unleash a torrent of diarrhoea. Relieved when it was all over, she turned to inspect the damage and couldn't believe her eyes. There in the toilet bowl was this big brown thing. She immediately called her doctor, who could offer no obvious explanation but promised that he would come straight round. When he arrived, she led him to the toilet, where he got down on his knees and took a long, hard look at the thing. Perplexed, he took out his pen and prodded it in the hope of finding out what it might be. And POP! The balloon exploded, showering poop everywhere – all over his clothes, up the walls and on the floor. "Doctor, are you all right?" she asked. Wiping the poop from his eyes, he said: "Do you know, I've been a doctor for twenty-five years, and this is the first time I've ever actually seen a fart!"