We get it, you got mesmerized by how half-and-half swirls into your iced coffee. It's a good rule of thumb to use if you're going rogue and making your own order so you don't overdo it. It's a pro move: Ask for a tall in a grande cup or a grande in a venti. If you want a grande size coffee, order it but ask for it in a venti-size cup. Otherwise, they'd leave you space for all that in your grande cup and you'll get shorted a few ounces.