Are the different responses by Rafael Nadal and Steffi Graf to the same question typical or is it just that Steffi has a good sense of humor?

Steffi Graf (born 1969), a former World No. 1 German tennis player, is considered by many to be the greatest female tennis player of all time. Wiki
Rafael Nadal (born 1986), a Spanish professional tennis player, is widely regarded as one of the greatest tennis players of all time. Wiki