BANKER'S HOURS, PART II. Why do they put "Wanted" posters of bankrobbers in the post office? So, when Henry and Mabel go to mail their bills, they say "Wait, Mabel, isn't that the guy that robbed the Farm and Home when we was in there last week?" And Mabel says "Yep, it looks like him. Blue shirt and black mask."
Of course, no one would rob the post office. Because you would have to worry that they had just fired somebody, and they would shoot you with the rest of them.