As suggested by lesserstorm, this challenge is about the masks and disguises people wear, whether literal or metaphorical. How much of Merlin's cheerful clumsiness is a mask? Do Arthur or Morgana show their real faces in court? And I'm sure plenty of mischief would ensue at a masked ball or banquet, not to mention the possibilities of masked outlaws, assassins, ninjas... just who is that masked man anyway?
The answer is up to you - shake things up however you want until 22.00 BST 24 May 2010 when all will be revealed again.