Gareth Roberts said this quote

“ William Shakespeare: 'Close up this din of hateful decay, decomposition of your witches' plot! You thieve my brains, consider me your toy, my doting doctor tells me I am not!' Lilith: No! Words of power! William Shakespeare: 'Foul Carrionite specters, cease your show, between the points... ' [he looks to The Doctor for help] The Doctor: 761390! William Shakespeare: '761390! Banished like a tinker's cuss, I say to thee... ' [he again looks to The Doctor] The Doctor: Uh... [he looks to Martha] Martha Jones: Expelliarmus! The Doctor: Expelliarmus! William Shakespeare: 'Expelliarmus!' The Doctor: Good old JK! ”