That bit in the Titanic where Leonardo DiCaprio holds Kate Winslet over the front of the boat and Celine Dion sings. I'd rather have my balls electrocuted than suffer the torture of having to watch that again.
A serbian film.
Or in hostel part 2 near the end where that bloke gets his man parts snipped off and fed to the dog. Coincidently it happens to be the torturer getting this treatment so all in all he probably deserves it.
That Blowtorch Clitorectomy scene in The girl next door (The torturey one, not the one about the porn star) made me wince, as did a lot of the rest of the film. The fact that it's based on a true story makes it even worse