A man, call him Brad, has been convicted of murder and sentenced to hanging. The hanging must take place on the final week of the year, sometime during the final five-day work week. The judge who imposed the penalty also dictates that the convicted man will not know beforehand which day of the week he will be hanged, in short, he requires that the specific day of execution will come as a very bad surprise. But the logic of the judge’s sentence implies that it cannot happen on the five-day week.