I formerly had an apartment neighbor who was new to apartments, and apparently raised in a very quiet household. (It was obviously her first time living alone.) Shortly after moving in, I began hearing terrible crashing noises from her apartment above mine, at all hours of the night. At first, I thought she might just be a klutz. After about two weeks the crashing/slamming noises became prolonged stomping/banging, and I began to worry that she might have an abusive boyfriend or something. I called my manager, and learned that apparently she herself was calling in noise complaints. But not about me. (I'm silent like ninja!)
She was calling about the people upstairs. Apparently, when she would hear them, say, close their front door, or run their dishwasher (cheap apartments with paper-thin walls,) her solution was to make as much noise as possible, by stomping on the floor. Never once did she come to talk to me or the people upstairs in person. When it became clear that the managers were getting tired of her nightly complaints, I eventually took to retaliatory harassment in order to expedite matters. The top-floor people would make a little noise, and she would start up a racket. Then, once I noticed that she had gone back to doing whatever she had been doing, I would take my floor lamp with the really heavy base, and give the ceiling one really hard knock from a random corner. (Which would be followed by another 30-second stomping fit.) She was asked to leave at the end of that month.