"How can a man be born when he is old?" Nicodemas asked. "Surely he cannot enter a second time into his mother's womb to be born!"
The supreme example of taking things too literally! This seems to have been a common failing with the Jews, yet Jesus was a a wonderful teacher in his use of metaphor and other figures of speech. Today many of our greatest scientists are of Jewish extraction. Is it a genetic thing, the ability to think logically in straight lines? Yet the Bible shows us that Jewish literature is filled with flights of fancy and invention. Perhaps it is just down to individuals, but Nicodemus is being obtuse here.