Donald F. Duncan Jr., the second contestant, was the son of Duncan Sr., an entrepreneur and inventor, who founded the 'Duncan Toys Company' in 1929. Duncan Sr. is most associated with the Yo-yo, which had commercial success and iconic status during the 20th century in the U.S. and abroad, largely the result of his innovative marketing tactics. Duncan's Birthday has been immortalized as 'National Yo-Yo Day', June 6.