If your going through the drive through, stick to coffee. The drive through is designed to speed things up, so people behind you are probably in a hurry (or lazy).
So, If your ordering an "everything bagel, toasted with strawberry cream cheese and a large green tea with 1 milk and 2 sugar - bag in, and 2 coffees 1 large, milk no sugar and the other medium, with just cream and a 40 pack of timbits".... (gasp).... GO INSIDE!
Not to mention what your doing to the environment making everyone idle for that long!
In the new world, the coffee shop drive through will be for beverages only.
AND SO IT SHALL BE WRITTEN!