Rain Man opens with Charlie Babbitt looking over a nice, brand-new Lamborghini. Charlie owns a collectible car company that is in financial trouble because of governmental rules. His secretary/girlfriend, Susanna, is stressed out, but Charlie keeps trying to keep the collectible buyers interested. Charlie and Susanna leave to go to Palm Springs to make a deal.

On the road, Susanna asks Charlie to talk to her since they're going away together for a few days. Charlie's phone rings, and his assistant tells Charlie that his father just died. The funeral is the next day in Cincinnati, and Charlie decides to go to the funeral. Although he hadn't talked to his father in years, Charlie feels compelled to attend. Susanna insists on going with him on the trip. The next day at the funeral, Charlie stands apart from the group, watching, while Susanna waits...