One possible plot twist could be that the 'killer' in the backseat is actually an undercover cop who was investigating the driver for some crime. So, instead of being a real threat, it turns out to be a case of misidentification.
Perhaps the 'killer' in the backseat is a figment of the driver's imagination, caused by some drug she unknowingly took or a mental illness she has. So, all the events that seem to be happening are just in her head, and she has to come to terms with her own psychological state while thinking she's in a life - or - death situation with a killer in the backseat.
The 'killer in the backseat' story might go like this. A character gets into their car, unaware that there is a killer hiding in the backseat. As they start driving, they might notice strange noises or movements. Maybe the killer reveals themselves and starts to threaten the driver. The driver then has to think quickly to escape or fight back, like trying to crash the car in a way that incapacitates the killer or finding a way to call for help while being held at knifepoint or gunpoint.
One common element is the element of surprise. The victim usually has no idea the killer is in the backseat until it's too late. Another is the sense of isolation, often the victim is alone in the car, on a lonely road or at night. And there is always a sense of immediate danger as the killer is in such close proximity to the victim.
There was a girl who picked up her car from the mechanic. Unbeknownst to her, a killer had sneaked into the backseat while she was signing papers. As she started driving, she smelled a strange odor. She was about to turn around when she saw the glint of a blade in the mirror. The killer hissed at her to keep driving. She was so terrified that she could barely think. But then she remembered a self - defense move she had learned. She quickly slammed her elbow back into the killer's face, causing him to drop the knife. Then she opened the door and rolled out of the moving car, getting away from the killer.
One possible plot twist could be that the T - Rex is actually being controlled by some other force, like an alien or a mad scientist. So, when the characters think they are just dealing with a wild dinosaur, they find out there's a bigger mystery behind it.
A plot twist could be that the character finds out that they are on the run not because of something they did, but because they have some special ability or knowledge that others want to keep secret. So, instead of being a victim of false accusations, they are now in a situation where they have to protect this secret while still evading capture.
A possible plot twist is that the prince is actually a vampire. He fell in love with Cinderella at the ball because he smelled her sweet blood. When he discovers her true identity, he tries to turn her into a vampire too, but Cinderella has her own dark secrets and resists. Also, the pumpkin carriage could be a death trap, and as soon as midnight strikes, it crushes everyone inside instead of just turning back into a pumpkin.
Well, in the 'connie short story', a plot twist might be that Connie is on a journey to find something, like a lost heirloom. But all along, what she's really looking for is within herself. Or perhaps she meets a stranger who she thinks is going to help her, but in the end, the stranger has been using her for their own gain. And it could also be that Connie discovers that her family has a big secret that changes everything she thought she knew about her life and her identity.
Perhaps a character who was thought to be an ally in the arena turns out to be a traitor, leading to a major shift in the story's direction. Or it could be that the prize for winning the arena is not what it seems, like it comes with a dark or unexpected consequence that the characters only discover after achieving victory.
Without knowing the actual story, it's difficult to determine the significance. Maybe he is the key character who drives the plot forward, perhaps he holds a secret or has a special mission while sitting in the backseat.
One possible plot twist could be that the spiders turn out to be intelligent and have a complex society. Maybe they are not just mindless killers but have a purpose for trapping the characters in the valley.