LESSON IN LIFE

A wise man sat in the audience and cracked a joke. Everyone 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 was no laughter in the crowd.

He smiled and said; 
You cant laugh at the same joke again and again, but why do you keep crying over the same thing over and over again?