25 WTF Moments From Friday The 13th Films
8. Douchebag Swimming Lessons - Friday The 13th Part VIII: Jason Takes Manhattan
In Jason Takes Manhattan, it's emphasized that the film's final girl, Rennie, is afraid of water and that she was never actually supposed to join the boat trip to New York. Along for the ride on said boat trip is Rennie's Uncle Charles.
In the second half of the film, a flashback is shown with Charles and a much younger Rennie on a boat together at Crystal Lake. While attempting to teach her to swim, he pushes her into the lake and using fear mixed with "encouragement" to expedite her swimming abilities. While underwater Rennie has an encounter with a young Jason Voorhees.
So, was the aquatic young Jason in the flashback real (within the story) or was it all just a delusion on the part of young Rennie who was struggling to swim? If he was real, what does that mean? He's just hanging out in the lake, waiting to harass little girls taking swimming lessons?