Smile Please

Why is it every time that I visit my local drive-thru resaurant, the person giving me food has the most sour look on their face? These people have obviously never heard of "service with a smile". What do they have to be so grumpy about? They knew when they took the job they would have to deal with the public. Part of this job is being courteous and smiling every once and a while. The next time I'm asked if I want fries with that, I will say"Yes, can I have a smile with that?" I'm The Eyeball and that's what I see.