Our musac speakers can't be turned off, so I long ago attacked all the ceiling speakers with wire cutters.  Presto- no more annoying music in our department.  President of the company happened to walk by why I was on the top of a desk, dealing with one of them, speaker in one hand, wire cutters in the other.  He asks what I'm doing.  "Turning the speaker down."  "Okay", he shrugged, and walked off.