He says, "Just for fun, Ma, I'm going to bring over 2 other female friends in addition to my fiancée 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.
The ladies leave and he then says, "Okay, Ma. Guess which one I'm going to marry."
She immediately replies, "The red-head that sat in the middle."
"That's amazing, Ma. You're right, how did you know?"
Spoiler:
