These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
Complete Monster: The mysterious serial killer loves playing cat and mouse games with his victims. He infiltrates a group of trainee FBI profilers on a field mission to a deserted island used as a training ground by the bureau, where the trainees must solve a case involving a fictional serial killer called "the Puppeteer." The killer sets the island up with an array of booby traps and puzzles to kill them while watching from within the group to turn them against each other and give himself good sport. His cruelest murders include a victim being slowly killed with liquid nitrogen from the feet up, and another one burned to death from the inside out through acid-laced cigarettes. He kidnaps the trainees' supervisor (who had been monitoring the group in secret) and proceeds to torture him for days before preparing his corpse and hanging it up for the trainees to find as a sort of perverse puppet. It's only after his identity as Sarah's best friend Lucas is revealed that the true level of his manipulation becomes apparent, and he frankly admits he started his murder spree by killing his parents as a child and now simply enjoys a good hunt for new and more intelligent victims.
Seeing Harris strung up to the ceiling, hanging by his face and limbs with hooks and wires was bad enough, but an alarm goes off that causes his body to jerk around like a puppet while children's music creepily plays.
The first murder, involving the victim getting sprayed with liquid nitrogen until they shatter into pieces, would not seem remotely out of place in a Saw film.