I Know What You Did Last Summer

I Know What You Did Last Summer is a 1997 American horror mystery slasher film based loosely off the book by Lois Duncan of the same name. The film stars Jennifer Love Hewitt, Sarah Michelle Gellar, Ryan Phillippe and Freddie Prinze Jr., and features Anne Heche and Bridgette Wilson in supporting roles. The screenplay was written by Kevin Williamson, writer of Scream. The film was followed by two sequels, I Still Know What You Did Last Summer and the straight-to-DVD release I'll Always Know What You Did Last Summer. The latter film did not star any of the cast from the previous two films.

The film received negative reviews from critics. However, the film was highly successful, grossing $125,500,000 at the box office. It was also nominated for and won multiple awards. As a result the film has been parodied and referenced in popular culture.