Complaining

A man writing at the post office desk was approached by an older fellow with a post card in his hand.  The old man said, Sir, could you please address this post card for me?
     The man gladly did so, agreeing also to write a short message and sign the card for the man.  Finally the younger man asked, Now, is there anything else I can do for you?
     The old fellow thought about it for a moment and said, Yes, at the end could you just put, >P.S.  Please excuse the sloppy handwriting.
     How often it is that we complain against those who do the most for us.

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