To celebrate the 12th day of the 12th month, Krispy Kreme is offering a buy one get one dozen doughnuts free tomorrow (12/12/2014).
The deal is with coupon only, which is attached here.
You can either print the coupon, or show it via smartphone or mobile device.
If you really want 24 doughnuts for some reason, this is a fantastic deal. It is has also been confirmed that you can order a dozen assorted doughnuts at regular price, and get a free glazed dozen with this deal as well.