ME: Medium coffee and a muffin please.
BARISTO (male form of Barista): We have a special going where if you get a large coffee the muffin is only a dollar.
ME: Would a large coffee and a muffin be cheaper than a medium coffee and a muffin?
BARISTO: Yeah, it would.
ME: But I don't want that much coffee because then I would want to drink it and I would be all twitchy and panicky. I only want a medium.
BARISTO: I'm just saying.
ME: Could you give me a large coffee but just put it in a medium cup so there's only a medium amount of coffee in my large coffee?
BARISTO: Sure, I could do that. Great idea!