A man writing at the post office desk was approached by an older fellow with a postcard in his hand. The old man said, "Sir, I'm sorry to bother you but could you address this postcard for me? My arthritis is acting up and I can't even hold a pen."
"Certainly, sir," said the younger man. He wrote out the address and also agreed 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 glanced at the card a moment and said, "Yes, at the end could you just add, 'PS: Please excuse the sloppy hand-writing.'?"