In the following, you are going to watch a video clip selected from a very popular British comedy show called The Two Ronnies. It ran from 1971 to 1987 and featured Ronnie Barker and Ronnie Corbett, who played many different characters. In this extract, Corbett and Barker have just played a game of squash. Squash (壁球) is a high-speed racket sport played by two players in a four-walled court with a small, hollow rubber ball. Barker has never played before. Corbett is the local squash champion and he is finding it difficult to keep calm. Do you know why?

Please watch the video clip and find the answer.