Yes, that purple screen with grey rectangles on it. I remember seeing some overlay rectangles when the channel returned from one of these incidents. It happened during Tom and Jerry (in the episode where Tom shouts "One for the money, two for the show..."). I remember seeing the letters "NTL" in one of these incidents. And let's not forget one Sunday afternoon where a PPG episode (Slave The Day) aired in Spanish (Menudo Día).