A popular motivational speaker was entertaining his audience. He Said :

"The best years of my life were spent in the arms of a woman who wasn't my wife!" 

The audience was in silence and shock. The speaker added:

"And that woman was my mother!"

Laughter and applause were heard.

A week later, a top manager trained by the motivational speaker tried to crack this very effective joke at home. He was a bit foggy after a drink.

He said loudly to his wife who was preparing dinner,

"The greatest years of my life were spent in the arms of a woman who was not my wife!"

The wife went; "ah!" with shock and rage.

Standing there for 20 seconds trying to recall the second half of the joke, the manager finally blurted out,

"....and I can't remember who she was!"

By the time the manager regained his consciousness, he was on a hospital bed nursing burns from boiling water