Repeat Twice

A husband was trying to prove to his wife that women talk more than men.
He showed her a study which indicated that men use about 10,000 words
per day, whereas women use 20,000 words per day.
His wife thought about this for a while. She then told her husband
that women use twice as many words as men because they have to repeat
everything they say.
Her husband looked stunned. He said "What? "