<p><br /> Robin Williams and director Bobcat Goldthwait have revealed some of the on-set antics when filming World's Greatest Dad.<br /> </p><p><br /> The pair, who are busy promoting the movie, admit they loved working together.<br /> </p><p><br /> Williams says Bobcat has one odd directing trait: "The only thing that is slightly strange is that he will wear hats that are so bizarre, just so you can't take him seriously when he gets mad."<br /> </p><p><br /> Goldthwait added: "It is actually to prevent myself from getting mad. If you scream at someone when you are wearing a sombrero then you are a douchbag."<br /> </p><p><br /> Worlds Greatest Dad is released in cinemas across the UK on Friday 24 September.<br /> </p>
