I'll Always Know What You Did Last Summer (R)
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This is a direct-to-video sequel to I Still Know What You Did Last Summer. It's the third and final movie movie in the franchise, though the only character from the previous movies is the killer. And he's... a bit different. Anyway, it came out in 2006, but I didn't see it until 2018. The movie did very poorly, critically speaking, but personally I thought it was okay. Not good, but not really as bad as some critics might say.

On the Fourth of July in 2005, a group of teenagers pull a prank at the local carnival. It's based on a legend inspired by the killer from the first two movies. One of the kids, Roger, dresses as the "Fisherman," and stalks another kid, P.J. Davis, who for no apparent reason thinks it would be a good idea to run from the "killer" by going up to the roof of a building and riding his skateboard. Meanwhile, their friends Amber, Colby, and Zoe are running away in feigned terror. The prank concludes with P.J. falling from the roof... but the mattresses that were supposed to break his fall had been moved, and he ends up impaled on a pipe. Colby thinks they should keep the prank a secret, so that the police (including P.J.'s father, Sheriff Davis) believe the Fisherman killer was real. Roger and Zoe agree, and finally Amber does as well, albeit reluctantly.

The next July, Colby returns from a year in L.A., without telling his girlfriend, Amber, that he had come back. When she finds out, he breaks up with her. And later, she receives a series of texts on her phone that say "I know what you did last summer." She seeks help from Zoe, who is now in a metal band. And eventually they also join up with Colby. And later, they're joined by P.J.'s cousin, Lance (who always had a thing for Amber). And um... there's also a deputy named Hafner who has a thing for Amber. And... then the real Fisherman shows up and starts stalking the four teenagers who'd kept the truth about P.J.'s death secret. The kids eventually suspect the sheriff is the killer, though of course they're wrong. And I dunno what else to say. None of it really makes much sense, but I don't care, because slasher films rarely do make sense... and because, aside from a supernatural element that was absent in the first two movies, the plot isn't completely nonsensical. I guess.