When you live in an apartment building, you tend to learn a lot about the people who live around you -- even if you're the kind of neighbor who avoids making eye contact whenever you're forced to pass someone on the stairs.
I never formally introduced myself to anyone who lived in my old building, but I could tell you my next-door neighbor's diet consisted solely of the smelliest fish on the market, and, based on the constant banging, the people who lived above me assembled IKEA furniture for a living.
Of course, that's just a small sample of the many issues you get to deal with when forced to live in unnaturally close proximity to other people.
While the banging might have been annoying, it was definitely more preferable than being forced to listen to people bang each other when I'm just trying to listen to the expertly written dialogue coming out of the mouths of the artfully crafted characters on "Castle."
If you ever find yourself in this situation, there is one (and only one) solution: Leave a passive aggressive note on your neighbor's door. If you're not sure what to write, feel free to use these for guidance.