Geez, you have to tell some people everything
This is a big problem in dorms, which luckily I no longer have to worry about. However, my sister still lives in the dorms and I am often reminded that this heinous crime is still, and forever will be, perpetuated by our nation's college students. Obviously, the point of pooping in the shower is to piss people off, because no janitor will clean up that poop without making sure the whole floor gets hit with a hefty fine.
If you feel the urge to poop in your shower, you should take one or more of the following steps: