 The famous scene that begins when Ty Webbs golf ball crashes into  Carl Spacklers ramshackle house was not in the original script. It  was added by director Harold Ramis (qv) after realizing his two  biggest stars, Chevy Chase (qv) and Bill Murray (I) (qv), did  not have a scene together. The three met for lunch and wrote the  scene together. Although the scene has nothing to do with the plot,  it is widely regarded as the funniest in the movie. This is the only  time that Chase and Murray have appeared in a movie together.