John the fish
When I was a sophomore in college, my five roommates and I were living in a dorm that had once been a men's dorm. How could you tell? The urinal in our bathroom.
We decided to make our urinal a decorative and practical feature of our suite. A plant was our initial idea, but we took this opportunity to instead introduce a suite pet. His species: Beta fish. His name: (wait for it...) John. I also suggested Harry or Dick... Thanks folks, I'll be here all week!
It was soon discovered that the water level in the urinal dipped when the toilet was flushed. My roommate E became certain that we were traumatizing John by making him live in that environment. This led to an argument--I insisted that the fish did not have enough brain cells to be traumatized, but she insisted that he could, arguing, "You're not God and you're not the fish!" To make her happy, we soon moved John to a bowl in our living room.
One day about a week after John moved to his new home, E was awakened by the cleaning lady. She was very agitated--she had flushed the urinal as she was prone to do occasionally to circulate the water and then noticed the sign:
Please do not flush the urinal--the fishy wouldn't like it.