Summary:
A discount site has been accused of a biting joke after it offered a $10 bill to celebrate Presidents Day, which is the first day of the year when a man is not a U.S. president.

Full article:
(CNN) -- Beware learning American history through Groupon promotions. Contrary to what the online coupon company claims, Alexander Hamilton was never a U.S. president. The discounter put out a news release announcing "Groupon Celebrates Presidents Day by Honoring Alexander Hamilton," and offering $10 off of all local deals above $40. "The $10 bill, as everyone knows, features President Alexander Hamilton -- undeniably one of our greatest presidents and most widely recognized for establishing the country's financial system," the Business Wire release read. Hamilton, whose portrait does grace the $10 bill, was the first treasury secretary and is credited with laying the foundation of the U.S. financial system. But he was never president. When people suggested Groupon's promotion was tongue-in-cheek, it responded through its Twitter account: "Joke? We'd never joke about saving $10! #AllKindsOfSerious" @carmstrong07 was not convinced, tweeting: "Gee whiz, it's almost as if @Groupon did something ridiculous to get everyone online talking about them." "We're shocked by this implication! Shocked!" the company replied. In case Groupon decides to give a $100 discount next year, Benjamin Franklin -- the face on the C-note -- was never a U.S. president either.