Coffee and donuts go together like avocados and toast, like peanut butter and jelly, like...well, you get the idea. The pairing is so perfect that Krispy Kreme is offering a deal for National Coffee Day, which is on Saturday, September 29. Starting today and continuing for a week until September 30, Krispy Kreme will be selling a donut topped with coffee-flavored glaze, along with a new drink called the Original Glazed Coffee, which the company says is reminiscent of a "donut in a cup.