For anyone who ever has, or currently is, living in an apartment, you are well aware of how thin the walls separating the units can be. For two neighboring tennants in Chicago, the paper-thin walls separating their apartments is apparently the same line between love and hate. Because one of them penned a "pipe down" missive to the other and then slapped it on her front door with hopes of shaming her into silence. However, "The girl in 517" shot back with a note of her own. Which a third neighbor who lives in the same apartment complex snapped a photo of it and posted it to Reddit for all to see.

[Source: Huffington Post]