The Bum in the Unlocked Bathroom: How Bad User Interfaces are Ruining Bathrooms, Buses, Video Games and Other Wonderful Things

I can summarize my experience designing user interfaces like this: if you were to place a refrigerator and a toilet side by side in a room with no windows and a door which locked from the inside, 9.3 out of 10 people entering that room would defecate in the freezer and urinate on the floor.