Doing the same thing over and over and expecting a different result

Allegedly, that's the AA definition of insanity. Case in point:

A woman called today. She placed an order, gave her address, phone number, all that stuff. But when given her total, she freaked out. "What?" she said. "Why is it that much?"

We patiently explained to her the cost of each individual item. Miffed, she said, "I'm gonna hafta call you back."

Five minutes later, she did so. She proceeded to run through the same process again -- order, address, phone number. Again, we gave the total... and, again, she freaked out. "What?" she said. "Why is it that much?"

I thought about suggesting she tattoo the prices on her thigh, but I don't think that advice would be taken in the spirit in which it was given.