We're celebrating National Popcorn Day, and you can celebrate with us by enjoying a free small bag of popcorn with toppings, popcorn trivia, and popcorn-themed activities. Popcorn is one of America's favorite snacks – so much so that Americans eat around 17 BILLION quarts of popcorn each year, enough to fill the Empire State Building 18 times, according to Lexi Jacobs, author of "The History of Popcorn."