Bill Murray is considered by many of his fans to be "the coolest man in the world". But how is it that this actor, who for a long time did little more than a few weird performances with strangers and crazy improvisations on TV shows, is now better known than many of his fellow actors with far more impressive filmographies? Although the film "Groundhog Day" was published a quarter of a century ago, the cult surrounding the American improvisational talent has never died down and is now becoming al...