Doing this on a live system is like performing kidney transplants on a playing mariachi band. The best case is that no one notices a change in the music; you chloroform the players one at a time and try to keep a steady hand while the band plays on. The worst case scenario is that the music stops and there is no way to unfix what you broke, just an angry mob. It is very scary."
OMG. I think I stopped and laughed for a solid 30 seconds when I read this.
I don't think I've ever felt so "seen" in my whole 25 years as a programmer.