1- A car accident
A boy and his father are injured in a car accident. Both are
taken to a hospital. The father dies at arrival, but the boy lives
and is taken to surgery. A grey-haired, bespectacled surgeon looks at
the boy and says, "I cannot operate on this boy -- he's my son.
2- Birth
Two children born in the same hospital, in the same hour, day,
and year, have the same mother and father, but are not twins.