Most of the rules of toilet etiquette that follow aim to achieve the above:
Do not take reading material into the office toilet.
Don’t peek under the doors. Knock if the stall (cubicle) appears to be occupied
Lock the cubicle (stall) door when you enter. You may embarrass someone.
Guys: choose a spot at the urinal farthest from anyone already there or at one end
While at the urinal, never turn to look directly or sideways at anyone standing there.
Especially, do not look in his direction any lower than his face.
Stand close enough to the pan or urinal so you don’t dribble on the floor.