“I Know What You Did Last Summer” premiered on October 17, 1997, just in time for the Halloween season. It debuted at number one on the chart, grossing $15.8 million, topping the other newcomer that weekend, “The Devil’s Advocate” ($12.1 million). But that’s just the beginning, as the film will continue to top the charts for another two weeks, not relinquishing the crown until “Starship Troopers” hits theaters in early November. Publicizing that Halloween hallway in such a short timeline is nothing short of impressive.
With a budget of just $17 million, the film grossed a whopping $72.2 million domestically along with $53 million overseas for a grand total of $125.2 million. In other words, almost 7.5 times its budget. Not to mention that this is a time when selling home video and cable TV rights will be important in terms of cash flow. Needless to say, a new franchise was born.
Sony rushed to produce a sequel in the form of “I Still Know What You Did Last Summer,” which came out next year, missed that Halloween timeframe and, instead, arrived in mid-November, but the heat was already on. descending and the sequel only made $40 million against a larger $24 million budget. The third sequel, “I’ll Always Know What You Did Last Summer”, was shot live on video in 2006. A flash of lightning in a burning pan is very bright but burns very quickly.
https://www.slashfilm.com/1053328/tales-from-the-box-office-i-know-what-you-did-last-summer-cashed-in-on-the-new-90s-slasher-craze/ I Know What You Did Last Summer Cast on a New ’90s Killer