An email correspondent writes: "This morning in the tube, I witness a big fat american tourist woman not being able to hold her enormous bulk upright against the train’s motion. First she nearly fell and people held her. Then, the next time the train jerked, she really fell, like a bowling pin and fell right to the ground. There she lay rolling around on her fat ### unable to get up again. People tried to help her up but she was too heavy. Eventually she shuffled accross the floor in a pose like when a rock guitarist slides to the floor on his knees, only less dynamically, and managed to drag herself up on a hand hold. She then dusted herself off and made some feeble noises like "Phooo! golly! Whoosh! Hey, OK now. Fine now. Phew!" while everyone looked on with a mixture of bemusement and pity. It was dreadful. It should have been funny but somehow it wasn’t."