A wise man sat in the audience and cracked a joke.
Everybody laughs like crazy.
After a moment, he cracked the same joke again.
This time, less people laughed.
He cracked the same joke again and again.
Till there is no laughter in the crowd,
He smiled and said:
You can't laugh at the same joke again and again, but why do you keep crying over the same thing over and over again?