Joe: Here comes a candle to light you to bed, here comes a chopper to chop off your head.
Referencing the 1744 children's rhyme and singing game, "Oranges and Lemons." Each line refers to the bells of a church near London. In the game, two children use their arms to create an arch, recite the rhyme, and bring their arms down to trap the children present when the last line is spoken. Those children then form a new arch with others, creating a steadily-longer tunnel. The same line is spoken in Season 2 of the UK series Being Human, which the author of this episode, Toby Whithouse, also worked on.