Forget the past and move on!

A wise man once sat in the audience & cracked a joke. All laughed like crazy. After a moment he cracked the same joke again and a little less people laughed this time. He cracked the same joke again & again. When there was no laughter in the crowd, he smiled and said, “When you can't laugh on the same joke again & again, then why do you keep crying over the same thing over and over again?”