From Kurt Vonnegut’s ‘Breakfast of Champions’’:
“An asshole is at the opposite end of the alimentary canal from the mouth. It is used for the elimination of solid wastes.
I have drawn a picture of an asshole here:
*
That is what an asshole looks like.”

I also like the slogan: “I only regret that I have but one * for my country.”
I don’t know who came up with that one.