What do you think of tipping at drive thru's such as Dunkin Donuts? Almost all of the Dunkin Donut shops in particular have tip jars prominently displayed in the pick up window. I don't think tipping is warrented for someone handing me an iced latte but I am wondering what others think.
Just to clarify, I am not cheap. I tip delivery people 20% and the same if I have curbside service at a restaurant.