When I was in college I lived wall-to-wall with a couple who had a very um, intense relationship.
If they weren't fucking, they were fighting. Often, they did both at once. Usually around 4 a.m. the morning of my big final. They would start with the moaning and orgasm sounds, then the physical violence would start - slapping, punching, name calling. Soon they'd be throwing heavy objects at each other and screaming obscenities (always missing and hitting the wall right where my head was, naturally) and eventually the woman would storm out, slamming every door in the apartment multiple times on her way, while the man stayed in bed and swore loudly for the next 20 minutes about what a 'fucking evil whore' she was.
The next morning they'd be back together, both with black eyes and swollen lips, doing laundry like nothing had happened.
I was relieved when they moved far, far away. She refused to acknowledge your greetings or make eye contact with you and he was real dick to everyone else in the building. They were by far the scariest, rudest asshole neighbors I've had in my multitude of living situations.