We've all made mistakes, but whats the worst one you've made? I learned to drive in only Fords, sure I had a Cavalier for drivers ed but you dont spend that much time in the drivers ed car. So when I got my Grand Prix I needed to learn the differences between Ford and GM car in how they work. One of the worst cases of this was the windshield wipers. In a Ford you just turn the nob and they come on, in the Grand Prix you need to turn the nob and push the stalk up. I went a for a few days thinking my wipers legitimately broken before I finally figured it out.