My wife and I got into some, ahem, heated discussions about her driving my car. I just wasn't comfortable with it and always put her off when she asked. I finally had to let her drive it to work because her car was in the shop while I had a plane to catch. It was raining that day of course (rain means more opportunities for stupid drivers to NOT watch where they're going) but she drove to work fine and when I got back in town I went to her office and picked up the p-car and let her drive my company van home.