The thing about April Fools Jokes, if someone tells me large
  computer display has been built using mice to splash paint
  behind a glass screen covered in chicken wire [to separate the
  pixels], I'd believe it. Because, yeah, it could happen. PS -
  it's pairs of Mice.* One to splash the paint, the other has a
  tiny squeeze to clean the glass before the next refresh.** When
  someone scrolls through a webpage, it's a beautifully
  synchonized event.