For my bday in May I didn't want a normal fattening cake with mega-calorie icing (but I still wanted cake, cuz I do love me some cake!), so we made a "Coke Cake". Basically, you just pick out your favorite boxed cake mix (we went with chocolate) and instead of adding the normal egg, oil, & water, you ONLY add 1 can of soda (diet or regular - we used Diet Dr Pepper). You can make a cake or cupcakes (we did cupcakes) and bake as directed. SOOOO yummy! We just added some light Cool Whip on top. It's definitely a little different than "normal" cake - little more crumbly (need to eat with a fork), but really really good and much healthier than regular cake. Plus, there are so many flavor options - just change up the cake flavor and the soda flavor! Mmmmmm!