No serial killer/police drama would be complete without the discovery of some sort of mental wall of newspaper clippings and photographs in the home of said serial killer/mental person. Usually stumbled upon in a police investigation or by an unfortunate potential victim.
It lets us viewers know that we are in fact dealing with someone who is completely bat-shit crazy, otherwise, why would they have the crazy wall?
Carrie had one mid-breakdown in Homeland, the True Detective lads also had a version in season one, even Tommy Dillon had one in Fair City.
So who puts these elaborate works of creepy art together? Why Palumbo and Sons of course!
(Full disclosure: This is a Funny or Die sketch, but dammit somebody should make a real business out of this.)