Have you ever worked in an office where someone insisted upon listening to their voice mail using the speakerphone (at full volume, naturally). It can really begin to bother you after a while. There was a fellow in my office who was the ultimate offender.
I found a fairly easy fix for that, though. I have my wife call his desk when he's not there and leave a message like "Hi, this is Candy from 1-900-HOT-BABE. You haven't paid for the 'toys' we sent you, you naughty boy. You wouldn't want me to come over there and spank you, would you?"
It is the last time you hear that particular speakerphone, I can assure you.