It's a day to celebrate the doughnut.  This is the day when you forget about your diet and eat mountains of donuts (paczki) and all the other things fat, greasy, sweet, full of cholesterol, generally unhealthy, and mmmmm.... Delicious.  I am so lucky to be of Polish decent.  I am making Paczki or Pounchki and then perhaps some  Chrusciki (Chruschiki).