The urinal etiquette instructed the user to maintain eye contact with the urinal at all times, and not chit chat or look at neighbours while taking a leak. The user generated stream also had to be parallel to the Earth's surface. Physics experiments, particularly those involving parabolic trajectories, were strongly discouraged.
“I just peed in the sink. Why? Because there was already somebody in the bathtub. ”
― Jarod Kintz