Question about a scene

Rating: 10/10 (10 August 2003)

I've only seen the movie once and I found it very good, albeit somewhat confusing. After consulting the other threads for the movie, any blanks I had were filled - except one: the scene in which two men share a laugh about an accident (probably the one in which Rita was in). After that, one of the men kills the other and takes a black book from his table. His attempts to conceal the murder and try to make it look like a suicide were very funny (he also kills a woman who lived next door and the cleaner)! My question is this: what was the bloody point of this scene??? The black book isn't referred to in previous or following scenes. Was this supposed to be a comic relief of some sort?