Caminante Nocturno
This scene could never get Eli Roth worked up enough to make him start masturbating.

Blaise
Because at the climax of the movie, instead of the Hero doing something amazing to save the girl, he did nothing in order to save the girl.
The girl died, and the villain wasn't even a supernatural uber-demon.
Neither a typical Hollywood ending, nor a typical slasher flick ending.

FeeFiFoFoTheFifeFifeBrown
Because Rutger Hauer as a creepy madman never works, right?

What?

Riskbreaker
The entire movie did that to me, french fries scene was the second best to this one.