A clever story:
A wise man sat in the audience and cracked a joke.
Everybody laughs like crazy. After a moment...
He cracked the same joke again, less people laughed this time.
He cracked the same joke again and again,
when there is no laughter in the crowd..
He smiled and said..
"You can't laugh on the same joke again and again,
then why do you keep on crying on the same thing
over and over again??"
-- Makes sense : )