Just passing a semi will some times piss off truck driver. I guess driving for hours will make some people snap.
Years ago I read an article in the news paper about a motorcycle driver that passed a semi at night. No one on the road. But evidently the truck driver just didn't like it. The guy on the bike didn't think any thing was wrong until he got hit hard by the semi from behind. The bike got wedged halfway under the semi's bumper, which ripped his right leg clean off. Believe it or not, the guy managed to free himself from the bike/truck and drop onto the ground. If you can call him lucky, he rolled under the truck, at highway speeds, with out serious injury.
Fearing that the semi would come back for him, he crawled off the side of the road into the grass. Tied off his leg and waited until dawn. Then he crawled back out until some one stopped to help him.
The police found the semi with the bike still stuck in his grill at a rest stop. The truck driver claimed he never saw the bike and didn't know he had hit any one.
It's a messed up world we live in.