In Hamlet a gravedigger asks the riddle: ‘What is he that builds stronger than either the mason, the shipwright, or the carpenter?’ Answer: ‘A grave-maker: the houses that he makes last till doomsday.’And yet they do not; this character has disturbed the bones of Yorick. ‘Doomsday’ is, of course, the archaic word for ‘judgment day’ and Hamlet is soon asking questions of the dead jester’s skull.