I know this isn't going to apply to any of us personally, but we have all seen it happen with neighbors at the park. It's a nice afternoon and a big rig arrives to use the back in space next to us. It pulls into a position that should be about correct for backing up. One of the couple, usually the female, but sometimes not, exits and walks around toward the back of the vehicle, makes some gestures and the rig starts backing up, a few yards later she is waving her hands frantically, yelling, “Stop! Stop!” He does and pulls forward to his original position