According to Rashi [Megillah 19a] - if a בן כפר already read the Megilla on the יום הכניסה and finds himself in an עיר on י"ד he reads again.
What's the point??! He was already יוצא??!!
Tosfos asks this question but doesn't "seem" to give a satisfactory answer עיי"ש...
Asking for a friend who dwells in a village but like to travel to the city.
