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Robin Williams and director Bobcat Goldthwait have revealed some of the on-set antics when filming World's Greatest Dad.
The pair, who are busy promoting the movie, admit they loved working together.
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."
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."
Worlds Greatest Dad is released in cinemas across the UK on Friday 24 September.