I agree with Mr. Greene's comments about the ethics of a museum guide.
However, there are times when the imp in some of us comes out and
leaves us with a humorous story.  One I heard was on a pipe organ
discussion group.

Anyone who has visited Salt Lake City and the Mormon Tabernacle knows
of the acoustic demonstration that is part of the tour.  The guide goes
to the podium at one end of the hall and drops a straight pin on the
podium.  The impact can clearly be heard in the other end of the hall.

A team of organ technicians were working on the famed organ and had
been asked to be quiet during the tours.  After several days of hearing
the pin drop, one of the technicians dropped a hammer in perfect time
with the pin.  The guide didn't miss a beat and continued on with their
presentation.

I'm sure there were many visitors that were sufficiently impressed with
the impressive acoustics of the hall.

Bill Budenholzer