Jaws was one of Hollywood’s first viral summer blockbusters—a global, collective event from the moment it opened in theaters exactly 50 years ago this week. To mark the date on June 20, Steven Spielberg has filmed a new introduction to the movie, which will have a summer run in theaters. Millions born long after the movie last disappeared from big screens still know the plot of the 1975 thriller: A terrifying great white shark attacks fun-loving beach-goers, sets off a panic, and is hunted down