... the kind that was used to build the automata that were trying to kidnap Mme de Pompadour in Doctor Who: when it breaks it harvests spare parts from living beings.
Fortunately the French Courtesan was equal to their foibles and reminded her contemporaries that "the Royal Court of France" should not allow its own sense of order to be upset by the arrival of mechanical 'men'.

David Tennant to the rescue!
Andrew