Shawn H.
Yelp
When I order at a drive through, I always thank the person taking my order. I'm not really looking for a reaction or anything. I just think it's a good thing to thank people who are doing something for me. I mean, I'm going to see this person in a minute, right?
So, when I thanked the guy taking my order here, he responded with "NO PROBLEM", which is okay in some scenarios--like between friends or maybe if you accidentally bump someone's car and no damage is done... but in a service that is being paid for?
Then, when I was searching for something in my car and the guy had opened the window to collect my money, he called at me, "DUDE" with some level of impatience in his voice. Again, probably okay between friends or maybe if I was buying a skateboard at a shop, but not so much when I'm buying lunch!
"No problem" and the exclamatory "DUDE" would have been okay if everything else was, but the guy didn't ask me if I wanted any sauce for my taco (This location is a Taco Bell / KFC together). I did want sauce, but only realized this after I had driven away.
The food was what you'd expect, but the service is what makes me drive through again next time. I always vote with my wallet (and sometimes lobby for change here on Yelp;)