I've had my moments of navigational confusion, believe me, but one of my pet peeves lately has been doing grand allegro combinations with folks who aren't paying enough attention to where they are in the room relative to others.   Does this happen to you? If so, this is your chance to vent..   This usually happens with a couple of students who tend to stare, mesmerized, in the mirror instead of looking around them as they move across the floor. They can do any number of unpredictable