Jerry's a pretty easygoing guy. Nothing makes him happier than running routes on the open road, no one to report to, no need to wash. It's the best! There's only one thing that can set him in a bad mood, and that's been mistaken for a Mack truck. After all, he's a Peterbilt and proud of it! In the movie, Lightning McQueen gets lost from Mack's trailer, and then he sees Jerry, who he thinks is Mack. So he went after him. Finally, when he caught up to him, it turned out not to be Mack at all. Then the truck drove away.