The two actors  involved    in  this    scene   quickly became  very
frustrated. They    couldn’t    keep    the scene   going.  Actor   A   had
made    a   joke    —   and a   rather  clever  one (“I’m   rather  attached    to
it”)    —   but the scene   itself  wasn’t  funny.  So  John-stone  stopped
them    and pointed out the problem.    Actor   A   had violated    the
rule    of  agreement.  His partner had made    a   suggestion, and he
had turned  it  down.   He  had said,   “You    can’t   do  that,   Doctor.”
So  the two started again,  only    this    time    with    a   renewed
commitment  to  agreeing:
A: Augh!
B: Whatever is it, man?
A: It’s my leg, Doctor.
B: This looks nasty. I shall have to amputate.
A: It’s the one you amputated last time, Doctor.
B: You mean you’ve got a pain in your wooden leg?
A: Yes, Doctor.
B: You know what this means?
A: Not woodworm, Doctor!
B: Yes. We’ll have to remove it before it spreads to the rest of
