A Jewish boy has married a shiksa (non-Jewish girl). The
mother gives him two ties as a present. When they next see
each other the boy is using the red one (the other was blue),
and his mother asks: "Why are you wearing the red one. Don't
you like the blue one".
A few weeks lather mother and child meet again. To avoid
confrontation this time he puts both ties, the red one and
the blue one. When the mother sees him, she says: "I always
knew this goy girl will turn my boy mad"