I've got to agree with Greg about the waiting room.

I am absolutely willing to turn the phone off once my name is called and I go into the examinatin room, just as I am happy and willing to so at the table or in the movie theater, the church, the courtroom, etc. But to be required to "turn off" while cooling my heels in an outer lobby is entirely unreasonable ~ especially when the nominal appointment time has come and gone! (And, regardless of who's at fault or why the schedule has been disrupted.)

For that matter, it's aggrevating enough to be called from the waiting room and ushered to the next stop, only to sit and wait (sometimes cold and half-naked) for 10-15-20 minutes before actually "being seen."