Trying to out do each other

There's Pepsi One, which is supposed to taste just like Pepsi with just 1 calorie. Now there is Coca-Cola Zero, which is supposed to taste like Coke, but with zero calories. Let me break it down like this, here's new names that I think they should use, but I doubt these were brought up during there marketing meetings:

Pepsi Shit

and

Coca-Cola Ass


Now lets do the Pepsi Challenge with that!!! I can see it now, "Ok sir, which one did you like better, shit or ass???"