Possible Clues:

• Highest-grossing film before “Star Wars”
• Thriller set in the seaside town of Amity
• ___ of Life (rescue device)
• Chats
• 1975 film with the line 'You're gonna need a bigger boat'
• Whence comes the misquote 'We're gonna need a bigger boat'
• Top film of 1975
• 1975 thriller filmed largely on Martha's Vineyard
• Scary film talks
• Thriller partly set aboard the Orca