Hey, Super Dave, we have a McDonalds full of those smart ones you wrote about. One even told me that there were 10 items to a dozen ... Oh, well!
I just walked away recounting my change and found she had actually given me my money back plus an extra dollar to go along with the fish sandwich and Coke. Sometimes it pays to go in these places, not often, but sometimes!
Maybe it is caused by the metal studs in her tongue, lips, and eyebrow pierceings she was displaying mixed in with all the energy from the overhead monitors and lights, etc. Heck, I suspect she actually glows in the dark!