4. The Last House on the Left

Considered a cult classic, The Last House on the Left features a long and graphic rape scene of two girls which is in some ways necessary to see when it comes to what happens next, but hard to sit through again on repeat viewings.

When the parents of one of the victims decide to seek revenge against the attackers, they do so in the most horrifying way possible, and nothing is off limits (including genital mutilation). The rape revenge genre is never easy to watch and is always controversial, but where The Last House on the Left succeeds where others fail is in the fact that it leaves you feeling both content and disgusted with yourself about why you were so happy to witness the brutal torture of another human being, even if they are a rapist and arguably deserved it.