Am I the only one weirded out when they come across somebody talking on their cell phone while using the facilities in a public bathroom? I've run into it several times in the last few weeks, and it bothers me. Not only is it poor ettiquette because nobody on the other end wants to hear you grunting and flushing and nobody else in the bathroom wants in on your conversation, but it's also very poor hygiene. If you get germs or viruses on your phone while using it on the can, washing your hands while still on the phone doesn't clean your phone, and the next time you touch it you just get them back.
Next time, just hang up before you go!