An artist called Martin John Callanan sent letters to all heads of state of the world telling them: "I respect your authority." An example:
Quite astonishingly, or maybe not, he got a lot of replies. Here's the Portuguese presidency:
Even better was when Callanan send a letter to dozens of religious leaders asking them "When will it end?":
Here's the Archbishop of Canterbury:
Saw this today at Whitechapel Gallery and thought this might amuse political junkies. There's a book with a selection of the letters, which I duly purchased. Here's Callanan's website, where I'll certainly try to find out more about his work. Like this, for example.