William Shakespeare used a quibble in "The Merchant of Venice". Portia saves Antonio in a court of law by pointing out that the agreement called for a pound of flesh, but no blood, and therefore Shylock can collect only if he sheds no blood, which is not physically possible. He also uses one in "Macbeth" where Macbeth is killed by Macduff, despite it being said that “none of woman born” shall vanquish him, as the latter character was born by Caesarean section.