The Wisdom of Solomon
Yossi and Yitzhak are on a train across Poland, each on his way to meet a prospective bride on the other side of the country. Halfway there, Yitzhak turns to Yossi and says, "Forget about this whole marriage thing. I just don't like the idea." So he gets off at the next stop and makes his way back home.
Meanwhile, Yossi continues on and is met at the final destination by the mothers of the two prospective brides. When the mothers realize what has happened, they instantly begin to fight over whose daughter should wed this precious little boychik. "He's mine!" cries one. "Not on your life," cries the other. "He will marry my daughter!"
After bickering for a while, Yossi and the two mothers decide to go the rebbe and ask him to resolve the situation. In the grand tradition of the ancients, the rebbe replies, "Well, there is only one solution to this problem. Cut the boy in half, and you each take half home with you." At this, the first mother looks shocked, while the second mother grins and cries emphatically, "Yah! Cut him in half!!"
The rebbe points to the second mother and says, "That is the real mother-in-law. Case closed."