Ask Mum

A young man excitedly tells his mother he's fallen in love and is going to get married. He says, "Just for fun, Ma, I'm going to bring over 2 other female friends in addition to my fiance and you try and guess which one I'm going to marry".

The next day, he brings 3 beautiful women into 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 red-head in the middle." "That's amazing, Ma. You're right, how did you know?" "I don't like her."