In 'Jaws', who plays shark hunter Quint?

In 'Gladiator', who plays the emperor Commodus? In 'Braveheart', which Scottish hero does Mel Gibson play? In 'Titanic', what is the name of the necklace's giant blue diamond? In 'Jaws', what is the name of the police chief? In 'Close Encounters of the Third Kind', at which landmark do the aliens land? In 'Thelma & Louise', which actresses play the title characters? In 'The Sound of Music', what is the family's surname? In 'The Sound of Music', which actor plays Captain von Trapp?