Su Wong marries Lee Wong. The next year, the Wong's have a new baby. The nurse brings over a lovely, healthy, bouncy, but definitely Caucasian, white baby boy. "Congratulations," says the nurse to the new parents.
"Well Mr.Wong, what will you and Mrs.Wong name the baby?"
The puzzled father looks at his new baby boy and says, "Well, two Wong's don't make a white, so I think we name him Sum Ting Wong.