Not just talking in the restroom... but trying to start a conversation at the urinal... you are standing there doing your business and some guy walks up to the urinal next to you, whips it out, and starts in with "hey, how's it going?"
Excuse me but when I have my wiener in my hand I'm not feeling chatty.
And how about those third world folks who wipe their bottom and throw the used TP in the waste basket?