I Really Don't Care What You Did Last Summer
It's summer in a Colorado Ski resort which means the teenagers don't have much to do other than to head to the fair. So with an idea to spice things up they stage a killing featuring the legendary fisherman who every July 4th is suppose to kill with his hook. But the prank goes wrong and one of them falls to his death leading to the others agreeing to keep the prank a secret. A year later and with those who left for college returning home it seems someone is not going to let them forget what they did last summer as they find themselves on the end of some threatening messages.
So 8 years after we had the sequel "I Still Know What You Did Last Summer" we got a third movie in the franchise although it isn't a sequel but a blatant act of grave robbing. In fairness the original plan had been to make a third movie in the franchise with the cast and characters returning but it got shelved, a completely different script was written, supposed cameos got dropped and much later than intended we got this a movie which trades on the name and the curiosity of the fans to make some money. It was a bad move as "I'll Always Know What You Did Last Summer" ends up weak and would have been more acceptable as a movie with a different name rather than supposedly part of the franchise.
But truth be told if they changed the name "I'll Always Know What You Did Last Summer" wouldn't be that much better as the concept has been used long before "I Know What You Did Last Summer" came along and there is little which can be done with it especially when placed back in the hands of teenage characters. As such "I'll Always Know What You Did Last Summer" ends up a procession through the obvious once we have the innocent schmuck ending up dead in a poorly conceived prank. Yes it takes its time, attempts to toy with us a bit and make the most of a ski-lift location in summer but in truth it doesn't succeed.
Whilst the familiarity is a problem along with the usual aspect of teenagers doing some really moronic things the other major problem which "I'll Always Know What You Did Last Summer" has is a lack of likeable characters which turns it into "I Really Don't Care What You Did Last Summer" and "I Won't Care What Happens to You This Summer". There is zero character depth and many of them border on being annoying enough that you wish they were dead.
What this all boils down to is that "I'll Always Know What You Did Last Summer" was a poorly conceived attempt to generate a little more cash out of a movie series which was dead and buried some years earlier and in doing so only disappointed those who enjoyed the first movie and maybe the second who out of a blend of misplaced loyalty and curiosity what this third movie.