Interesting fact:

The famous shark in Jaws is actually barely in the film! It doesn’t appear until one hour and 21 minutes into the two-hour movie. Not only was the editor worried that the mechanical shark would begin to look stupid if it was on camera too often, the thing quite often refused to work! It caused endless frustration for the cast and crew and Spielberg began referring to it as “The Great White Turd” on set. The joys of filmmaking!