Pooping at work - Rules #A

When pooping at work, it is best to never acknowledge another person's existence in the bathroom. At all.

However, if you are going to acknowledge someone, a subtle head-nod is next best. 
Do NOT wink or smile at anyone.

If you absolutely must open your damn mouth, a one syllable greeting is next best: Hey or 'Sup, are quasi-acceptable. 

Using someone's name is absolutely forbidden when in a men's room: 
Saying "Hey Steve" is terrible etiquette, because you have now just effectively outed Steve to any lurkers in the stalls... Maybe Steve just took a stinky dump and wanted to remain anonymous and sneak out of the restroom quietly, but you come in and "Hey Steve" him?!? Not cool.