A fascinating tidbit from Wikipedia, on the intertwined history of certain flap-eared royal fruitcakes and Alfred E. Neuman:
In 1958, Mad published letters from several readers noting the resemblance between Neuman and England's Prince Charles, then nine years old. Shortly thereafter, an angry letter under a Buckingham Palace letterhead arrived at the Mad offices: "Dear Sirs No it isn't a bit – not the least little bit like me. So jolly well stow it! See! Charles. P." The letter was authenticated as having been written on triple-cream laid royal stationery bearing an official copper-engraved crest. The postmark indicated it had been mailed from a post office within a short walking distance of Buckingham Palace. Unfortunately, the original disappeared years ago while on loan to another magazine and has never been recovered.
If it really is true, it's bloody amusing. :)