Some of these titles invite a question about the episode. "The Suit that Turned Left" is a case in point. You are made to wonder, how can a suit turn left? Finally near the end of the episode, Wesley makes the statement about his suit and why the bus is at the side of the road.I believe there are quite a few episodes that have titles not used by the characters. While Roy Clarke did title many episodes using phrases from the script, there are also many that are simply descriptive. Many of the holiday episodes, for example, have descriptive titles.