[Prudence]

Once upon a time there was a monastry and every morning the chief Monk came
in and chanted "Good Morning", and all the other monks chanted back
"Morning".

One day, a new monk arrived at this monastry, and the chanted morning
greeting and reply were entirely new to him. But as this monk had a sense
of humor, he decided see if he could have some fun with this.

The next day, when the chief Monk came in and chanted "Good Morning", and
all the other monks chanted back "Morning", the new monk at the back chanted
"Evening."

Whereupon the chief monk chanted. "Someone chanted evening. He must be a
stranger!"