I worked as a barista in many different cafés for way too many years. Once, a girl ordered a drink I'll never forget. She wanted a "half-decaf, two percent, extra caramel, not too hot, light foam, caramel macchiato." The groaner on this one was when she said, "And I want the decaf shot on the bottom and the other on top." Behind her, her boyfriend pantomimed a sincere and embarrassed apology.
For those who don't understand why this was a ridiculous order, the way you pull a double, half-decaf pair of shots is by mixing decaf and regular grounds into the same group and pulling it (the old machines had no way of pulling single shots). You'd have to pull four shots and throw two of them away in order to segregate the shots. Not to mention the fact that by the time the drink was in the orderers hands, both shots would be all cozy and intermingled anyway. So we just nodded and smiled and made her a normal half-decaf caramel macchiato and she never knew the difference.
The other trick to this order, though (which you might want to keep in mind) is that the "caramel macchiato" is a signature Star$ drink, which is made like a vanilla latte with caramel on top. A true macchiato is more of a shooter, if you know what I mean -- esspresso plus a little milk or foam to give it color. So this particular order would vary depending on what kind of café you're imagining.
Regardless, ordering any hot, half-decaf beverage and demanding the decaf be poured first and the regular second, is going to make any barista groan because it doesn't make any difference whatsoever by the time the drink is passed out. It's as silly as ordering a cup of two different kinds of hot tea, and then demanding that one be poured before the other. By the time you drink it, it won't matter. Heat does that to liquids.
