Mitsubishi Corp., Life Stages
A man drives his car as a series of life experiences in the vehicle are relived, starting with his early single life. He is seen driving sexy women, partying with friends, and a hippie with his arm around him apparently making an advance (the driver carries a gross-out expression).
As it progresses, the women he marries is in her wedding dress, he carries friends in costume, his wife is then ready to deliver a child, then the child is in the backseat.
While it is unclear of the nature of the hippie's presence -- be it a friend with the wrong idea or a hitchhiking stranger -- it is clear that he negatively rejects the others' interest.