Touche'.

This discussion came from me trying to reason why I should have a caffeinated Diet Coke at work while on the dreaded diet (we're supposed to limit the caffeine intake):

Kelly: "I've really gotten hooked on Diet Dr Pepper lately, but that's a Pepsi product, so it's not in our vending machine."
Sharon: "You know you can get Diet Dr Pepper WITHOUT caffeine, right?"
Kelly: "Ew. Kind of defeats the purpose, doesn't it? I mean, that's like smoking a cigarette and replacing the tobacco with hay. It just doesn't yield the same effect."
Sharon: "Eh, good point."