Mother in Law

A young man excitedly tells his mother he`s fallen in love and that he is going to get married. He says just for fun,"Ma, I'm going to bring over 3 women andyou try and guess which one I'm going to marry." The mother agrees.
The next day, he brings three beautiful women to the house and sits them down on the couch and they chat for a while. He then says"Okay, Ma, guess which one I'm going to marry?" She immediately replies: "The one on the right."
''That's amazing, Ma! You're right. How did you guess?' The mother replies, "Simple.I didn't like her!