I will try not to think about the cheap internet cafe i was at earlier... I think the keyboards were originally light gray, not carbon; and those headphones...
I work in tech support and we're supposed to keep our phones on us at all times. The only place we don't take our phones is to the bog.
Anyway, I've made the mistake of wandering in for a dump with my phone in my pocket, and getting a call whilst squeezing one out. Once, some joker at the urinals piped up and commented to his mate, "Hey, I didn't know we had piped music in here now!"
Its not a big deal really. I've rang people when they were going wee wees, and mates of mine have rang other mates only to find out they're taking a dump. I spose it'd only be a problem if you could hear insane amounts of flatulence on the other end.