Now you see him, NOW YOU DON'T....
- The entire premise of the film, which has loads of Paranoia Fuel and Fridge Horror aspects to it. An already unstable scientist uses a serum to become invisible and as a result loses his sanity completely to the point of becoming an Ax-Crazy psychopath. A slasher film, essentially, with an invisible villain. Sleep tight!
- There's also the fact that throughout the events of the film, no cure/ability to reverse the effects of the serum is able to be created/found, despite the attempts of his fellow scientists who he eventually turns against. And that's not even going into the implications of what one would do while invisible or what would happen to one who was unwillingly stuck with such a person without their knowledge. Special mention goes to one scene in which the Villain Protagonist, fully invisible, rapes his next door neighbor after spying on her for years. And that's just the opening coda...
- The whole scene with the neighbour is made worse by a detail easily missed, Sebastian set an alarm for when she comes home so he can spy on her, if there is one major behaviour of stalkers, it's that they learn everything they can about their victims, in this case, Sebastian knows exactly when she gets home.
- The scene where Sebastian becomes invisible, layer by layer. Instead of being the Nightmare Retardant you’d think it’d be, the outdated CGI makes the scene even creepier, and when combined with Sebastian wincing and writhing in pain it almost makes you feel bad for him.
- Caine venting his anger about Linda and Matt's relationship by brutally and literally smashing a dog against a cage.
