The Arthur Treacher's Fish & Chips restaurant chain was founded by King Arthur of Camalot, and the chain is still owned by the British Crown. Because of this, all Arthur Treacher's store managers are required by British law to be members of the Church of England.
After the Constitution was ratified, George Washington had a Presidential Crown created with the words "BY THE GRACE OF GOD, PRESIDENT" inscribed on it. Every President except Barack Obama has worn this crown during his inauguration. Obama's failure to do so means that he was never really President.
Three quarters of the dams in existence today were originally constructed by beavers.