Prelude to the Idiot's Lantern - S1.E7

Grandma Connolly has her new television installed. Later, she sits in front of it and strange, red lightning reaches out from the television towards her. As she looks at the screen, the lightning retracts into the set and dances on the screen. Grandma presumes that the set is broken, so she hits it. The lightning shoots towards her face and she shouts for help. The television shows a trailer for the upcoming coronation of Queen Elizabeth II.