Two little boys walked into a chemists. "May I help you?," asked the assistant. "We'd like a box of Tampax, please," replied the older boy. "Is it for your mother?," the assistant asked. "No," the boy replied. "Oh, then it must be for your big sister." said the curious assistant. "No, it's for my little brother," the older boy replied enthusiastically. "We heard on TV that if you use Tampax you can swim and ride a bike and he can't do either one yet."