I'll call it The Toothbrush Scene...
because calling it what it really is might get this message deleted. My god. I remember seeing this film as a teenager in the late 90s, and being completely shocked at this little moment. I mean...POO...in a toilet. And from an attractive young woman, no less. We're not used to that in America (remember, we're rather chaste). Outrageous. How often do we see such a thing in cinema? I'm at a loss for other examples.
That's not to say that the rest of the film wasn't memorable. I enjoyed its disturbed atmosphere, but the poo scene, for me, was the most shocking moment.