Bake DIET CAKE with ONLY 1 additional ingredient?

Just heard on Rachael Ray's Show (from Hungry Girl, who's getting her own show on the Cooking Channel!)…

Can you guess what that 1 ingredient is?

One can of DIET soda!

Yes, that's right… You can bake DIET cake from a box by SIMPLY adding 1 can of any flavor of diet SODA — and nothing else (except the cake mix, of course) 


Nuturitional Data:
Prepare a box cake as instructed:
250 cal / 10g fat

With ANY FLAVOR DIET SODA:
170 cal / 3.5g fat