I have a newfound respect for my wife's driving abilities thanks to something she let slip yesterday. I was dropping her off at work, and she was unloading her work stuff from the car (seriously, it's more of a storage locker than a car sometimes). She set a bottle of water on the roof, and said, "I have to remember to take that bottle. Last week I drove to the vet's office with a can of Diet Coke on the roof."
"It didn't fall off?" I asked.
"No, it was on the roof when I got there."
Our vet isn't far from home, less than half a mile. But because this is Chicago, that short route includes two stop signs, a stoplight, a speed hump, and three turns. She had to brake, accelerate, and turn pretty smoothly to keep a can of Diet Coke on the roof!