Speaking in Riddles

Drive Thru Lady: May I take your order please?

Me: Can I have a large coffee please.

-the computer screen at the drive thru shows "1 large coffee"

Her: Is that all?

Me: Actually... can I have an extra large please?

-the computer screen at the drive thru shows "2 large coffees"

Me: No, no - could I please have one SIZE extra large coffee.