Sometimes I call the bathroom the "urination lobby" and just recently (like at this very moment) I shortened it to "u-lobby".
I don't like saying lavatory (too institutional), or bathroom (what if there lacks a bathtub) or toilet (a little crude), or restroom (I do not rest in said room) , or powder room (a little old fashioned, and I don't powder), loo is ok, but I'm not in England or Australia, so instead I've termed the area in which the toilet and a sink reside the U-Lobby.
Anyway, whilst I was visiting said u-lobby, I was presented with a very interesting predicament: a gentleman decided he wanted to strike up a conversation with me as I was washing my hands. A sort of "hey, how's the weather" type of conversation, but communication nonetheless. I obliged but I was thinking, why do people feel the need to chat it up in the bathroom? I'm in there for one purpose and one purpose only. I do my business (as I tell my dog) and get out.
So please sirs, don't speak to me in these places of ... "business".